Quote:
Originally Posted by M21Sniper
The original M-16(the AR-15) was 1:18 rifling, reduced to 1:12 in the A1 model, and 1:7 or 1:9 in the M-4/M-16A2+. (depending on date of manufacture, the early M-16A2s all had 1:7" rifling)
1/4" mild steel i can believe- are you sure it was stainless though? The NATO std penetration test uses a 10mm mild steel plate. Stainless is typically much stronger/stiffer, and M193 is definitely not well known for penetration.(M855 is MUCH better in that regard)
|
Sorry for the misinformation. The Mini-14 might be 1:11, most likely 1:12, to fire the old M193 ball ammo. The new Mini-14 has a 1:9 twist.
I'm pretty sure we shot stainless steel plates. My friend had extras from trying to work on his boat's engine. He bought them for bracketing or something like that. I remember him telling me those were stainless steel. But regardless, 1/4" is only 6mm, far less than 10mm. Plus we shot at a very close range, maybe around 20 meters. The M193 ball did not penetrate a 2nd steel plate. It didn't even dent it. It merely scratched it. The 303 British went through both plates with lots of warping at the edges.
The best way to compare the penetration power of the 5.56mm and the 7.62mm is to fire them from the Mini-14 and the Mini-30. They are essentially the same gun, just different chambering. Unfortunately I don't have a Mini-30 handy.
