what is the term of ball coeff in reference of a rifle bullet?
414822
Henry -- If you post your question to this list: \nhttp://sports.groups.yahoo.com/group/handloading/\n\nYou will have 8 accurate answers, 7 responses making the answers better and 3 wise cracks.\n\nJoin and have fun! \n\nLeigh M\nPortland\nTell the moderator JBB that I said Hi
958311
your "hold over" has several varibles,  caliber, bullet weight, temp, etc etc etc  software is available to answer your question.\nhttp://www.huntingcorner.com/ballistics/ballistics-chart-rifle.html
1094674
The bolt or the firearm is blown back, by the gases, to feed another round. I believe this is used on the HK G3, and the P7, as well as FAMAS rifle.\n\nIf you aren't refering to firearms, blowback is also a term used to describe the unforseen effects of covert operations.
486904
If you mean a gun then the recoil is due to the rapidly expanding gasses that propel the projectile forward.  this obeys newtons first law for every action there is an equal but opposite reaction.  Because the gas expands in all directions it exerts a force on the gun and the bullet equally the bullet moves because te force acting on it is greater than the force needed to move the bullet. the gun doesn't move as much because the force required to move it is greater.
1138083
I don't remember his name but i recall hearing about a guy in the army in the vietnam era who didn't fight because the army kept him in America because he was such a good shooter it made good PR for the army. I remember being told that he could toss asprin in the air and shoot it with a .22.
922451
Actually there are cases of casualties and injuries.\n\nMythbusters the show on the discovery channel did an episode about this where they try to see if a bullet fired up into the air can come down and kill you.\n\nHere is a synopsis.\n\nEpisode 50: Bullets Fired Up, Vodka Myths III\n\n    * Bullets fired up into the air can be lethal: busted, plausible, and confirmed.\n  \n\nThe "all of the above" ruling on the bullets fired into the air myth was a new one for MythBusters. All of their tests showed that if you fire a bullet perfectly straight up into the air, it will not kill you as it will fall down on its side and have too low of a terminal velocity to kill, much like the Penny Drop myth. However, it is very difficult to fire perfectly straight into the air and they even found an international expert in falling bullets who was able to confirm for them that people have died from bullets fired up into the air.\nBullets Fired Up\n\nMyth: A bullet fired up can come down and kill you\nHow high would a bullet fly up?\n\nAdam's idea was to correlate the density of ballistics gel with the density of air (Jamie: "Huh."). Adam figured that if they could see how far a bullet traveled in ballistics gel, they could use the difference in density to calculate the distance it would travel through air. Adam calculated that the ballistics gel is 650x more dense than air, so, according to his theory, if a bullet fired into ballistics gel goes 1ft, it would go 650 ft through air. At least that was the theory: they would have to go to the firing range with some blocks of ballistics gel to see if it would work.\n\nThey lined up several blocks of ballistics gel end-on-end at the South San Francisco Police Department firing range (last seen in the Catching a Bullet with Your Teeth myth). They quickly ran into a problem. The 9mm round went through three blocks of ballistics gel for a total distance of about 5ft. The much more powerful .03-06 only went one block in. This wasn't so surprising given the results of the Bulletproof Water myth, though they didn't seem to anticipate the same happening with ballistics gel. The .30-06 rounds travel much faster, so they a greater tendency to break up on impact. Jamie managed to flip a block of ballistics gel with a final shot, finally putting an end to this particular avenue of testing: the ballistics gel was not going to help them figure out how far a bullet would fly up.\n\nBased on the failure of the ballistics gel experiment, they used a computer simulation program to calculate how high the bullets would travel up into the air. The calculations: *.03-6 10,000 ft 58 seconds\n\n    * 9mm 4,000 ft, 37 seconds\n\nTerminal velocity of a falling bullet\n\nAdam built an acrylic wind tunnel (much like the one in the Penny Drop myth). Air was shot up through the bottom and a bullet was dropped into the chamber. The terminal velocity was calculated based on the speed of the air needed to make the bullet stop falling. They figured that the terminal velocity was 100mph (150 ft/s). The wind tunnel also showed that the most stable falling position for the bullets was on their side.\nFiring bullets at terminal velocity\n\nThe rigged up an air hose to an aluminum pipe to launch the bullets at terminal velocity (150 ft/s). Their first shot put a good dent in the metal door. Their next target would be a pig's head, just as soon as they got the amount of air pressure tuned correctly. A chronograph was used to measure the speed of the bullet and a solenoid valve was attached to the tube to control the air flow.\n\nThey fired bullets from the pipe into the pig's head and recorded it all on the high-speed camera. At 166 ft/s, the 9mm bullet bounced right off of the pig's head. The .30-06 bullet did only slightly better, piercing the skin and then bouncing off.\n\nIt was looking like this was going to be busted, but, as it turns out, there is an international expert on falling bullet
1097929
I'm not sure who usually uses compressed nitrogen to shoot a bullet out of a gun.  Typical firearms use gunpowder, an explosive chemical mixture.  The bullet is propelled by the force of expanding gas in the explosion.\n\nPractically anything can be used to propel a bullet: explosive material, springs, leverage, compressed gases, etc.  The most powerful guns (those used on battleships and gun implacements) used plastic explosives to push their projectiles.  \n\nThere have been some experiments with using charged particles as a source of projectile propulsion.  The repulsive force between powerfully charged electromagnets can be INCREDIBLY powerful.  Theoretically, it should be possible, using current technology, to fire a small projectile at an appreciable fraction of the speed of light.  Obviously, this would take an enormous amount of money and some incredible engineering.
286424
The longer barrel of the rifle means that the bullet is being accelerated over a longer distance.  If you assume a constant acceleration (which isn't quite the case) the velocity formula is \nV = sqrt(2*A*L)\n(V=velocity, A=acceleration, L=length)\nSo, with the same assumption, a doubling of the barrel length would result in multiplying the velocity by sqrt(2).
1102976
a) It will decrease in speed as soon as the accelerative force of the explosive gas ceases to be greater than the drag of the gun barrel or the air or other media it passes through. This could mean that it begins to slow down in the barrel, or soon after leaving it. Certainly, after a few feet from the gun barrel one would expect the gases from the gun to be dissipated and the bullet to begin to be dragged by the air. However, the reduction in speed of a high velocity bullet could be negligible for seconds after firing.\n\nb) As soon as the bullet leaves the barrel it will begin to drop towards the earth. The formula for this is: \ndistance =0.5*acceleration*(time-squared)\n\nAcceleration at sea level is 9.81 metres per second per second. Thus it will take almost exactly 2 seconds for the bullet to drop the 20 metres from your firing platform. (square root of [20/(0.5*9.81)]  )\n\nc) See b above. The bullet is acted upon by gravity at all times. It is only prevented from being accelerated downwards by a force equal or greater to its weight pushing it up. In your example the gun barrel supports it until the bullet leaves the barrel, then begins to fall. Even if you pointed the gun straight up, the bullet will be slowed by gravity as soon as it leaves the barrel and gases behind, gradually slowing to a stop and falling back to land on your head.\n\nIf the bullet had enough horizontal velocity to make it to the horizon within two seconds, it would have acheived the required "escape velocity" to leave or orbit the earth, always falling but never landing. As the horizon at sea level is eight miles away this would need a speed of 28,800 miles per hour or 46,340 kilometers per hour. \n\nThe speed of sound is c.1,220 km/hour, so this would be 38 times the speed of sound!\nThe muzzle velocity of most military calibres is c.700metres/second or 2, 520 km/h or twice the speed of sound.\n\nThus in the two seconds it takes the bullet to fall to earth it would have carried some 1,400 metres.\n\nd) Very much so!
234424
Depends on the gun and the bullet.  Different kinds of bullets have aerodynamic designs and powder charges that vary their speed when leaving the barrel.  For most handguns (say a Colt .38), that speed is around 300 meters per second.  On other kinds of wapons (say a Desert Eagle Cal. .50) The speed can go to around 400 meters per second with a heavier projectile, and so on.
365737
Assuming you fire parallel to the ground, then the bullet will be at its maximum horizontal velocity when it leaves the barrel, and will be at minimum vertical velocity.  The bullet cannot increase in horizontal speed once it has left the barrel, as there is nothing to make it accelerate.\n\nDue to air resistance, the horizontal velocity will decrease as the bullet travels further and further.  The vertical velocity will increase, as the gravity of the Earth "attracts" the bullet.
58473
The terms rimfire and centerfire describe two basic types of cartridge design. The difference between the two types is in the location of the priming compound in the cartridge case. The priming compound initiates the burning of the main powder charge when it is struck by the firing pin of the gun.\n\nA rimfire is so called because the priming compound is actually inside the rim of the case, which is of folded construction. Look at a .22 LR cartridge and you will immediately see what I mean (3rd link). The firing pin of a rimfire rifle strikes the rim of the cartridge when you pull the trigger.\n\nA centerfire cartridge has a separate primer in the center of the base of the cartridge case. The rim of a centerfire case is solid. Look at a .30-30 cartridge and you will immediately see the difference. The firing pin of a centerfire gun strikes the primer located in the center of the base of the cartridge, rather than the rim (see 2nd link). Such cases are much stronger than the rimfire type, and can contain much higher pressures, which makes possible modern high velocity rifles and pistols.
731163
I agree with you - this term is used very often.\n\nThe metaphor of the silver bullet applies to any straightforward solution perceived to have extreme effectiveness. The phrase typically appears with an expectation that some new technology or practice will easily cure a major prevailing problem. The term originates from folklore. Traditionally, the silver bullet is the only kind of bullet for firearms that is effective against a witch, vampire, monster, or a person living a charmed life.\n\n\nOther suggestions: Panacea, Magic bullet
454546
never shooot a gun in the air. a bullet never has a name on it!! i wouldnt even shoot at the ground, it could bounce off a rock or something. stick to targets, much safer!
79521
It depends on the type of bullets and the type of gun that you use to fire the bullet.\n\n.22 rimfire cartridge 1200 - 1500 fps \n.22 centerfire cartridge 2400 - 3000 fps \n.22 Swift 4000 fps \n.38 Special 600 fps \n.221 Fireball 2650 fps \n\nThis gives you an idea of the velocity of bullets.
275775
There is a link below for general info.\n\nhttp://en.wikipedia.org/wiki/Marlin_Firearms
840106
With in the casing above the trigger is the fireing mechanism, This consists of 2 springs ( 2 double barrel, 1 for singal barrel) and 2 hammers (1 hammer if singal barrel) The hammers are alined with what we call fireing pins which are also alined with the primer of the cartridge once the gun is loaded.\nOunce the trigget is pulled then the spring forces the hammer to hit the fireingpin, which hits the primer sending a chane reaction through the cartridge for the conbustion to take place with the gunpowder, then the casing(wad) which the shot is positioned behing projects the buckshot up the barrels at roughley 450ft per sec . That is just a simple explanation of a tipical double barrel shotgun. How ever some,  more common in over&unders work on the theory of inertia, where the recoile from the the first shot activates the mechanism for the second shot, its also the same princable for semioutomatic shotguns.