I shoot off hand with my 375 H&H and my 300 Win Mag at 100 yds. I shoot at an 8" target. The way I do it is I bring the rifle up to the target and it is moving around so I do my best to hold it still and when I'm over where I want to shoot I fire and I can get 2 out of 3 shots inside the 8" target. I keep practicing so I'll be able to get all 3 shots inside the 8" target. And when I can do that I'll go to a smaller target.