I have M855 and M193, and some decent 3/8 AR500 torso targets. They'll be shot out of 10.3" barrels, mostly. In theory I'm good at 100m, with even a 14.5" barrel, but one of the ranges I get access to is only 75m. Which is less likely to dimple the steel at that range? Green tip has the steel penetrator, but M193 has higher velocity. The short barrel will reduce velocities of both, of course.