Generated Recoil: The amount of force exerted on the firearms action, stock or grip.  The factors affecting this force are the charge or amount and type of powder in the cartridge and the weight of the projectile. The internal pressure is created by the rapidly expanding gasses that are created when the solid propellant or gun powder ignites and turns into a gas. The only way to modify the amount of force is to reduce the charge or the bullet weight. Generated recoil is a constant if all variable are left unchanged. 

Physical Recoil: The amount of force exerted through the firearms action and stock or grip to the shooter. This force is also referred to as Felt Recoil or Perceived Recoil. Though the amount of Generated Recoil is constant, there are several factors that effect the forces on the shooter, if the variables of the chambered load are left unchanged. Additional information on the factors that can be used to reduce felt recoil are listed below.

Anticipated Recoil: Probably the most dangerous form of recoil, is anticipated recoil.  In firearms as with most things in life, 90 percent of the battle is fought and won in the mind. If you are psyched out and nervous about or fear the recoil, you are going to have a bad experience. If you use  the proper shooting stance and apply the steady hold factors, the shooting experience will be fun and you will normally ask for more. Nervous and fearful shooters often do not employ a proper shooting stance and may be brutalized by the recoil of a Big Bore Rifle or Large Caliber handgun as they are not mentally and physically prepared to take a shot.

Recoil Reduction: Physical, Felt or Perceived Recoil can be moderated by the shooters: Grip, Stance, Mindset and Reduction or Absorption systems installed in the stock or in the action. Muzzle Breaks and Compensators are often used on Rifles and for Sporting handguns. Breaks and Compensators vent some of the gasses using a cut or vent added to or cut into the end of the barrel. Other muzzle breaks screw onto the end of a threaded barrel and feature vents, cuts or holes that allow the gas to expand and therefore not have as much time in the barrel to push back against the action and the shooter. 

Butt Pads placed on the butt stock of a rifle are the cheapest and probably the most effective means of reducing the force exerted on the shooter. Modern Recoil Reduction Systems in rifles are typically installed in the stock and use a dampening system with mercury or another heavy metal that moves inside a tube to dampen and reduce recoil. In addition to the reducer tubes, adding weight to the stock can help but are generally less effective that the dampers. In handguns, a dual spring guide rod and stiffer weight recoil springs are often used to reduce the amount of energy transmitted to the shooter. The Harts Recoil Reduction System uses a mercury insert in the guide rod similar to those found in rifles, while the Sprinco Recoil Reducer uses a dual spring guide rod.

Synthetic or rubberized grips on a handgun can reduce the amount of Physical / Felt / Perceived Recoil. Other factors that can effect Physical / Felt / Perceived Recoil are the style and composition of the stock, with a straight line stock, absorbing more energy. The total weight of the firearm is also an important factor in the amount of force transmitted to the shooter. Many large caliber handguns have heavy weight frames to absorb some of the transmitted energy. 

Big Bore Rifles are typically 10 to 12 pounds and adding additional weight to the stock can further reduce the amount of force. Many people feel that composite laminate wood or synthetic stocks absorb more of the Physical / Felt / Perceived Recoil than do traditional wooden stocks. My personal experience does not prove this to be true if the wooden stock is of solid material and the proper weight for the chambered load. Most custom and expensive Big Bore Rifles still use a solid wooden stocks with the traditional dampening tube installed in the stock.

A Word About Recoil
Written by Dave Estergaard - Father of the .470 Mbogo
Web URL: http://www.470mbogo.com

Everyone has his or her own tolerance to recoil both generated and anticipated. I've found that most people are worried more about the anticipated recoil but once they have tried to shoot a large bore rifle, they are surprised and would like another try. This is of course with a firearm that is designed properly with a straight-line stock, good balance, a decent recoil pad area and a good weight. 

The Pachmayer Triple X Recoil Pad is a wonderful addition to any large bore rifle. It slows down recoil velocity and absorbs foot pounds of recoil like a sponge in water. Most guns that generate recoil in the 85 to 90 ft. pound range should weigh in the ten and a half to eleven and a half-pound range. I've put together a short video to show the impact of the 470 Mbogo and also to show that the cartridge is very shootable. 

It starts with three rapid fire shots from the shoulder to show the real muzzle jump and recoil of the 470 Mbogo. The next two shots are 500 grain Barnes Solids at 2480 feet per second, the third is a Barnes 500 grain X bullet at 2485 feet per second. The balance of the clip shows that the cartridge is very manageable and it's all a matter working up to or loading down to your own comfort zone. I hope you find this both interesting and helpful. Reading articles by people that judge big bore rifles as unmanageable above a 375 H&H Magnum are misleading to a lot of people that could be better served with a larger caliber firearm whether for a trip to Africa or just for fun. 

Magazine article descriptions and pictures of shooters with their firearms pointing to the sky in recoil put out a pretty scary image. Now you can see for yourself that it's very manageable with practice.

Off Net Link to .470 Mbogo Recoil Videos. Click on the thumbnail images to see or download the video. The video files linked below are in MPG format.

Hand Loading & Reloading Terminology

BELL
To flare a case mouth to receive a bullet easily.

BULLET
A piece of metal formed into a projectile. Available in a variety of shapes and weights.

BULLET SWAGING
The forming of a bullet using pressure in a die instead of casting molten lead in a mould.

CALIBER
The approximate diameter of a bullet or gun bore.

CARTRIDGE
A completely loaded, ready-to-fire round of ammunition.

CASE
A metal cylindrical container which holds the primer, powder and bullet. Also called brass.

CASE FORMING
To form cases of one caliber into a different caliber.

CHAMFER
To bevel the inside of a case mouth. The bevel allows bullets to start into the case mouth without crushing the case.

CHRONOGRAPH
An instrument used to measure the velocity of a bullet.

COMPONENTS
The parts that make up a cartridge. The case, primer, powder and bullet.

CRIMP
To bend inward the mouth of a case to grip the bullet. Used only with bullets having a cannelure or crimping groove.

DEBURR
To remove the small metal burrs from inside and outside of a case mouth.

DECAPPING
Removal of the spent primer from a fired case.

DECAPPING PIN
The slim needle-like rod in the sizer die which pushes out the spent primer.

EXPANDER
The part of a die that expands the case mouth to receive the bullet.

FLASH HOLE
The hole through which the primer ignites the powder charge in a case.

HAND LOADING
Another term for reloading.

HANG FIRE
Slang term for any detectable delay in cartridge ignition.

IGNITION
The action of setting a powder charge on fire.

JACKET
The cover or "skin" of a bullet.

MISFIRE
The failure of a cartridge to fire after the firing pin strikes the primer.

NECK
That portion of a case which grips the bullet. In a bottlenecked case, that portion of the case in front of the shoulder.

NECK SIZER DIE
A die used to resize only the neck portion of the fired case back to approximately its original dimensions.

POWDER
The substance that ignites in the cartridge and propels the bullet.

POWDER CHARGE
The amount of powder loaded into a case.

PRIMER
The small cap containing a detonating mixture used to ignite the powder charge in the case.

PRIMER POCKET
The cavity in the bottom of a case into which the primer is seated.

PRIMER POCKET SWAGING
The "smoothing out" of the crimped primer pocket found in military cases.

PRIMING
Installing a new primer into a case.

RAM
The steel rod running through the center of the press that holds the shell holder and drives the case into the die.

RELOADING PRESS
The tool which performs the major tasks of reloading.

RESIZE
To restore a fired case to approximately its original size.

ROUND
A military term for one complete cartridge.

SEATER DIE
The die that seats the bullet into the mouth of the powder charged and primed case.

SEATING DEPTH
The depth to which a bullet is seated in the case mouth.

SHELL HOLDER
The part that holds the case in proper alignment while the case is being run into the die.

SIZER DIE
A die used to resize a fired case back to approximately its original dimensions.

SPENT PRIMER
A primer that has been fired.

Rockets: History & Theory

Sometime during the 11th century the Chinese discovered how to make a simple rocket using gunpowder for fuel. It didn't take the military leaders long to realize that the rocket could be used in defense of the great China wall. They strapped the rockets to their arrows and greatly extended the range of the bow and arrow.

Centuries later at White Sands Missile Range rockets are used to push guided missiles to their targets. Rocket engines are also used to propel test instruments and experiments into the upper atmosphere over Southern New Mexico. These rocket engines used today work on the same principles that made the Chinese fire arrows so effective.

In the 20th century the term "rocket" has become a household word. Huge rockets carried man to the moon and back. Because of rockets, Americans enjoy instantaneous world-wide communication via satellite. We even get a daily cloud-cover picture of our area taken from a satellite which was launched into space by a rocket. Soon people may be riding in rockets on a regular basis to get to work in a space station. In short, the rocket is the key to the exploration of the other worlds in the universe.

Early Rocket Development

According to historians, the Chinese built the first working rockets. They were also the first to use them for military purposes. In A.D. 1232, some ingenious military leader used arrows powered by small gunpowder rockets to successfully defend the city of K'ai-Fung-Foo against the invading Mongols.

From that time until the 20th century, the rocket had its ups and downs. It was quickly introduced in Europe in the 13th century as a firework and as a weapon. During the Renaissance every army had a rocket corps. But artillery improvements eventually made the cannon more effective because of increased range and accuracy. Occasional improvements in the rocket would bring it back into popularity, but usually not for long.

During this time one Chinese official hit on the idea of using rockets to propel a man through the air. It was around 1500 that Wan Hu rigged a pair of kites together with a chair attached in between. He then tied a series of military rockets to the kites and drafted a group of coolies to light the rockets. Not wanting to miss out on the chance for fame, Wan Hu decided to be his own test pilot. According to reports, he sat in the chair and gave the order to light the rockets. There was a lot of noise and a great burst of flame and smoke which blocked everyone's vision. When the smoke cleared, Wan Hu was gone. The story ends there and the reader is left to his own conclusions.

Used as a barrage weapon the rocket often proved effective for military purposes. In the late 1700's, Haider Ali, Prince of Mysore, India, used iron rockets to defeat a top British unit in battle. The British, in turn, used the rocket against the United States.

"O Say, Can You See...."

In the War of 1812, the British used rockets developed by William Congreve, one of the few men who worked to improve early rocket design. In "The Star Spangled Banner" the reference to the "rockets' red glare" is a description of the British bombardment of Fort McHenry with Congreve rockets.

Congreve and an American, William Hale, did a lot during the l9th century to force armies to reactivate their rocket corps. Congreve's success came in his ability to extend the range of his military rockets to as much as 3,000 yards. Hale attempted to solve the problem of low accuracy by spin stabilization, a technique still used today. As the century progressed, artillery technology again by-passed the rocket and in the beginning of the 20th century, rockets were more a matter of speculation than reality.

Authors Jules Verne and H. G. Wells wrote about the use of rockets and space travel and serious scientists soon turned their attention to rocket theory. Knostantin Tsiolkovsky, a Russian, worked on rocket design and theory in the early 20th century. In his numerous writings he proposed space exploration by rocket, liquid propellants, the multistage rocket and space stations.

Hermann Oberth, a German scientist, also contributed to the theory and design of rockets. In 1923 he published a work in which he proved flight beyond the atmosphere is possible. In a 1929 book called "The Road to Space Travel" Oberth proposed liquid-propelled rockets, multistage rockets, space navigation, and guided and re-entry systems. He also advanced the idea of a transatlantic postal rocket for quick mail delivery. It was taken seriously at the time but never attempted.

From 1939 to 1945 he worked on German war rocket programs with such notables as Wernher von Braun. After the war he came to the United States where he again worked with von Braun. During the war one of the weapons the scientists were designing was reminiscent of Oberth's postal rocket. The German's wanted to build a rocket which would carry a bomb from Europe to strike New York City.

Most historians call Oberth and Tsiolkovsky the fathers of modern rocket theory. If that is so, an American, Dr. Robert H. Goddard, can be called the father of the practical rocket. His designs and working models eventually led to the German big rockets such as the V-2 used against the Allies in World War II. All three men are enshrined in the International Space Hall of Fame in Alamogordo, N.M.

Goddard started working with rockets in 1915 when he tested solid fueled models. In 1917 when the U.S. entered World War I, he worked on perfecting rockets as weapons. One of his designs turned out to be the forerunner of the bazooka, a tube launched, recoilless missile, 18 inches long and one inch in diameter. It was actually tested in 1918 but the war ended before it could be used against German tanks.

Space Flight Possible

In 1919 he published a paper entitled "Method of Reaching Extreme Altitudes." In it he concluded that a rocket would work better in a total vacuum than in our atmosphere. This was against the popular belief of the day that a rocket needed air to push against. He also suggested that a multistage rocket could reach very high altitudes and even reach the escape velocity of the earth.

The press scoffed at his ideas and public reaction was poor. Goddard went on experimenting and on March 16, 1926 he flew the first liquid fueled rocket. After the initial success, he flew other rockets in rural Massachusetts until they started crashing in his neighbor's pastures. The local fire marshal declared his rockets were a fire hazard and ended his tests. Charles Lindbergh came to Goddard's rescue by helping him get a grant from the Guggenheim Foundation. With it Goddard moved to Roswell, New Mexico, where he could experiment without endangering anyone. There he developed the first gyro-controlled rocket guidance system and was eventually flying rockets faster than the speed of sound and at altitudes up to 7,500 feet. It was a huge improvement over the first liquid-fueled rocket which went 220 feet and was in the air only 2.5 seconds.

View photo of Dr. Goddard in his workshop

During World War II, the U.S. military saw little use for rockets. The Army did use bazookas but it was the Germans who took Goddard's ideas and turned them into real weapons. Goddard died in 1945 just as he started to receive some recognition for his work. One of his biographers said, "It is virtually impossible to design, construct or launch a rocket today without utilizing same idea or device originated by Goddard."

Under von Braun, the Germans perfected the large liquid-fueled rocket which culminated in the V-2 long range ballistic missile. It was the largest rocket vehicle at the time, being 46 feet long, 5.5 feet in diameter and developing 56,000 pounds of thrust or push. At the close of the war the allies captured V-2 components and the German development team surrendered to the Americans. The team and components were sent to White Sands Missile Range, New Mexico.

A V-2, assembled and launched on the range, was America's first rocket to carry a heavy payload to high altitude. A V-2 set the first high altitude and velocity record for a single stage missile, and a V-2 was the first large missile to be controlled in flight.

Jointly, the American and German scientists at White Sands worked to develop missile and rocket systems. From their work came such missiles as the Corporal, Redstone, Nike, Aerobee and Atlas.

Rockets have been around for centuries but no one has really understood how they worked until just recently. It was only 70 years ago when Goddard proposed that a rocket does not need air to push against. This is now obvious with the manned flights to the moon. But how do they work then?

How Rockets Work

Rockets obey Issac Newton's Third law of motion which says for every action there is an equal and oppositely directed action. When a hunter pulls the trigger on his rifle, a small gunpowder explosion occurs in the shell. One reaction to this explosion is the bullet and smoke being pushed out the end of the barrel. At the same time there is an equal reaction or push in the opposite direction which is the recoil into his shoulder. He doesn't feel much because the force or action is trying to push the whole rifle as opposed to the small bullet on the other action.

If the hunter was on roller skates when he pulled the trigger, the recoil might be enough to push him backwards. And if he kept up a rapid rate of firing, he might pick up speed and continue to move backwards.

The same thing happens in a rocket. The rocket is the same as the rifle and instead of firing bullets, the rocket shoots out a stream of hot gases at supersonic speeds. The gases are pushed out as a result of the burning of a fuel in the combustion chamber.

Another way to look at this is to think of a long tank, shaped like a short pencil. If the tank is filled with compressed air and sealed, nothing happens. The gas is inside pushing against the walls, but the pressure is equally distributed. If one end of the tank is opened, the air pushes through the opening very quickly. According to Newton there should be an equal action in the opposite direction. There is. The air pushes on the front inside of the tank and if it is great enough the tank will move forward.

In a rocket engine the combustion chamber is very much like a rifle barrel or an air tank with one end open. In the rocket, a fuel, which can be a liquid like kerosene or a solid like gunpowder, is burned. The burning releases gases and heat which build up pressures in the chamber. The pressure pushes the gases out the exhaust nozzle. The reaction or push in the opposite direction drives the rocket forward.

The nozzle or exit hole for the pressurized gases is not just any opening. It is specially designed to open outward like an ice cream cone. This makes the gases exit even faster, which in turn, gives more push at the other end of the combustion chamber.

Rockets do best in outer space where the gravitational forces are less and there is no air resistance to overcome. But, there is also no air to keep the rocket fuel burning. Rockets work in space because they are completely self-contained. The rocket carries a fuel and an oxidizing agent like oxygen so it needs no outside air.

This explains why Polaris missiles can be fired from submarines while they are underwater. The fuel and oxidizer can be in solid or liquid form.

The huge rockets which hurl the astronauts and satellites into space use liquid fuels like kerosene or super-cold, liquid hydrogen and oxidizers like liquid oxygen. When the two liquids are sprayed into the combustion chamber, they ignite and burn with explosive force.

Use of Rockets at White Sands

At White Sands Missile Range, most of the missile systems under test use solid fuels and oxidizers. In a solid propellant, the fuel and oxidizer are mixed together and placed right in the combustion chamber. This makes the missile smaller than one using liquid fuel because there are no storage tanks for the fuel. Some solid propellants like nitroglycerine don't even need an oxidizer mixed in with it.

The solid-fueled rocket engine has many advantages for the military. It is smaller which makes it very portable. The solid fuels are much easier to handle than the caustic and sometimes super-cold liquids. Also, solid fueled rockets are always ready to fire. They do not require the preparation which a liquid fueled rocket would need.

Today's missile systems are much more than a rocket engine with a supply of fuel and oxidizer. There is usually some sort of payload. This can be a test package or a bomb. The missile will have some sort of guidance system to get it to its target and it has an airframe to hold all the parts together.

The Missile Park at White Sands Missile Range has a wide range of missile airframes on public display. They include a V-2 along with missiles used by the U.S. Army, Navy and Air Force.

For the future scientists are looking for other types of rocket engines to replace the chemical ones now used. Any self-contained system which can push matter out an opening will produce push or thrust. Therefore, even a balloon could be considered a rocket.

One idea researchers are looking at is using a nuclear reactor to heat a gas so it expands and becomes pressurized. The gas can then be forced through a nozzle which would create the necessary opposite action to drive a vehicle forward.

Scientists also have contemplated using an ion beam to push a spacecraft. This system calls for accelerating charged molecular particles in magnetic fields and then beaming them out the nozzle end of the engine. Another plan calls for thrust to be provided by ejecting photons or light from the engine.

These devices are theoretically possible but they lack the powerful thrust necessary to escape earth's gravity pull. Since the turn of the century, the rocket motor has gone from being a firework and little used weapon to being the key to man's dreams. The rocket has made space exploration possible. Men have already walked on the moon and exploratory spacecraft have flown past the planets in the solar system, sending back valuable information. The rocket is the key to open up new worlds for Man to explore.

Rocky Mountain Elk Foundation

The Rocky Mountain Elk Foundation is represented in all 50 states, plus an international membership in Canada and 26 foreign countries. The Elk Foundation's notable success stems largely from it's dedicated and enthusiastic membership, particularly the Foundation's local volunteer committee members who organize annual fundraising Big Game Banquets in their communities.  Other forms of fundraising include the Habitat Partnership Program; Supporting, Sponsor and Life memberships; the annual convention; and merchandise and royalty programs.  The commitment to wildlife conservation and love of America's rich wildlife legacy are at the heart of what the founders of the Elk Foundation glimpsed when they established this organization.

The mission of the Rocky Mountain Elk Foundation is to ensure the future of elk, other wildlife & their habitat.  In support of this mission the Elk Foundation is committed to:

• Conserving, restoring and enhancing natural habitats;
• Promoting the sound management of wild, free-ranging elk, which may be hunted or otherwise enjoyed;
• Fostering cooperation among federal, state and private organizations and individuals in wildlife management and habitat conservation; and
• Educating members and the public about habitat conservation, the value of hunting, hunting ethics and wildlife management.

The Elk Foundation meets it's mission by funding the following types of efforts:

• Habitat enhancement projects such as prescribed burns and water developments;

• Wildlife management projects such as elk transplants and cooperative initiatives among elk and livestock interests;

• Research on elk and their habitat to provide wildlife managers with information needed to manage elk;

• Conservation education programs to increase the awareness of the importance of wildlife and their habitat with people of all ages;

• Land conservation projects such as acquisitions and conservation easements; and

• Hunting heritage projects to promote ethical hunting and ensure future hunting opportunities.

RMEF Online 
Rocky Mountain Elk Foundation is on the web at URL: http://www.rmef.org