As I was finishing an evening of punching some paper recently, just for a lark, I tried some 300 grn REAL conicals in my .54 GPR. I used an over the powder wad and 90 grns Swiss FFg. I fired 4 rounds, from 50 yds, using cross sticks and cloverleafed 3 shots, with the 4th about 1.5" low and left. I was shooting into a stiff headwind which was causing some difficulties in stabilizing the rifle on the sticks, so I was shocked it shot so well. Maybe I just got lucky but I haven't had a chance to try them again, which I will do just because I am curious. My GPR shoots balls so well, and since the .54 ball will handle anything I am going to hunt, that I have no desire to use a conical for anything beyond occasional target shooting.