The old man had a problem with those shockwaves holding together from his Thompson Center Pro Hunter .50 cal. But to be fair, he had them screaming pretty good out of it. That barrel of his really doesn't start talking to you till you reach around 100+ grains of Swiss or around 90 grains of that high octane stuff like T7 and BH209. Slowed down it shot groups around 2" but once you pumped up the volume it tightens up to an inch at 150 as long as you do your part.