Hody Pards,
Why doesn't anyone use a spiral pointed bullet? Is it because it isn't periord correct?
Be honest here,
Help me out guys, I have my heart set on spiral bullets, but I would like to know the facts!!
As allways, any and all advice will be greatly appreicated!!!
ACE
O.k., I think I can shed some light on this one.
The reason many shooters DON'T shoot (Spire) "Pointed" bullets in their BP Cartridge Rifles is because of the velocity/s.
For the most part most BP cartridge rifles shoot subsonic or slightly above and "close to" the speed of sound (at the muzzle) but then the velocity rapidly falls off.
It was discovered way back when (what, in the 1850s and into the 1870s) by both our Government and others that the "best" design for bullets flying at these speeds was those big Round Nosed bullets like the ones listed as "Gov't Bullet" and similar.
This holds true with .22 Rimfire bullets as well including those shot in Olympic and other shooting competitions.
It's not until the bullet spends a good deal of its time at Supersonic speeds that the various "pointed" shaped bullets fly better, and are more efficient, etc.
Also along these same lines there are a couple of other factors that are worth knowing about.
One is that any time the bullet goes supersonic (which happens IN the firearm's barrel on acceleration) it's subject to a great deal of turbulence.
Since this happens IN the barrel it's not subject to turbulence going UP in speed. But when it slows down, and has to cross back into the realm of subsonic flight, it once again encounters this turbulence, and must go through a period where that can affect the accuracy.
This is why .22RF "Match" ammunition is Subsonic. They don't want any transitions affecting the accuracy of the bullet's flight.
Another thing to understand is that when a bullet is flying at supersonic speeds it's pushing a shock wave in front of it that acts as a "wake" (similar to a boat's). This creates something called a "virtual bullet" which gives the bullet's cross section something like 3X the area for wind to act on it.
So again, it's "good" for a bullet to fly either REALLY Fast (and this is where the "pointy" shaped bullets come into their own) or else BELOW the speed of sound.
Speeds just above the speed of sound probably aren't so hot, you're better off staying just below the speed of sound.