I own a 62 cal nwtr ( bored .625) that i worked up a "decent" load with .600 ball. I had the room, so i got a .615 mould. I used the same load as the .600, 70 grns 3f, nitro card over powder, .010 mink oil patched ball. It shot higher, no suprise got a tighter fit. Spread wasnt very impressive. Not a shock 1st time out, just askin for thoughts, prolly more powder less? Lose the nitro since it fits tight as hell,? Lose the patch n use shot card? I plan to test all, just wanting thoughts on sompin i may be missin. I prime with what i got, be it 4f 3f or god ferbid pyrodex, they all fire. I will "never" put pyrodex in bore, personal prefrence, no need to argue fellows...