Twist rate and penetration with M193
If we are running 55gr/M193 in suburban/urban area, is a 1:7 or 1:9 more approriate if overpenetration is the primary concern? A slower twist rate would be sufficient for stabilizing the 55, but I have also recently read that in Stoner's orignial design a slower twist rate was used (in the original rifle length system) to impart a "just stable" flight on the round, resulting in significant cavitation and instability upon impact. In short....
Does anyone have any knowledge of how twist rate can effect penetration with the 55gr/M193 Round?
Would be run on a 16" Mid-length system