Next time out, shoot in over bags on the bench.Don't touch your sight yet,same sight picture. See if it will group and where@25. If it's center and a little high, move out to 50 yards.This is where you want her bullseye centered. That's a pretty stout load, but if you handle it well, it should be a good moose load. I like mine between 70-80,2f in a .62. I've used a 22 thou wet patch under a .600 ball, short started, and my wood ramrod for range and trail shoots.
Just want to add,Squirrel. The crown.I think this a critical part too. I've found that if it is cut a little more to one side or the other, it will throw the ball right or left depending on which side has more meat.Also check(you probably have,but I'll mention it anyways) that the muzzle is cut off square. I'd fiddle with it more before tweaking(bending) the barrel. PM me if you like.