An 8 to 10 inch tube will provide plenty of acceleration. One doesn’t need much barrel length to develop a minimal 1,000 fps of velocity with a heavy, large caliber bullet. 44 is a lot more effective than the paper ballistics would lead one to believe.įor those who enjoy playing with calculators, a factor of 2.22, times the proposed bullet weight in grains, will equal foot pounds of energy at a velocity of 1,000 fps. 44 carbines were very impressed with their lethality. In the 1960s the friends and family of the Ruger empire spent quite a bit of time in Africa with their. 44 Magnum, the 44’s greater mass and deeper penetration will prove far more deadly on large animals. 223 bullet will develop 1,250 foot pounds of energy at 3,200 fps. 44 Magnum bullet driven at 1,000 fps will delivery 666 foot pounds of energy. At 1,000 fps the same slug will only deliver 444 foot pounds of energy.Ī 300 grain. At 2,400 fps that bullet will deliver 2,558 foot pounds of energy. That, times the bullet weight in grains, will equal energy in foot pounds. One standard formula divides velocity squared by a factor of 450,400. Since the formula for energy squares velocity, it can be seen that the subsonic bullet must try to make up for the loss of power with mass, clever bullet design and accurate shot placement. Subsonic bullets travel much slower than high-powered rifle bullets. The only thing left is the plop of bullet impact, which can be quite loud on occasion. By hovering around 1,000 fps we can virtually eliminate bullet flight noise. With effective suppressor technology we can all but eliminate the sound of a muzzle blast. With a properly designed system, the loudest sound will be that of the bullet strike. A warm barrel or a hot cartridge can easily push velocity up another 150 fps, even though the cartridge contains a bullet of the same weight and powder charge. Any faster, and one runs the risk of breaking into the sound barrier (1,100 fps) in a hot environment, where gunpowder burns more effectively. Any slower, and we’re leaving precious velocity on the table. We won’t get heavily into the science of it, but a velocity of 1,000 fps (or roughly 300 meters per second) has long been considered optimal, since well before World War II. The sound of a subsonic bullet whizzing through the air at 1,000 fps is very quiet indeed, certainly less than an arrow from a bow at 200 fps. Unlike the more powerful supersonic rifles, whose bullets generate their own supersonic crack, subsonic rifles are capable of delivering very quiet, almost undetectable, accurate fire. This article will deal with choosing, loading and using accurate subsonic rifles. The Use of Sound Suppressors on High-Powered Rifles
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