Not sure what you are interested in shooting. Paper, other targets , gongs or game. Rate of twist will dictate some conicals not good or good. I reckon yours is a 1:28? How fast of vel. do you want to push them? Heavy powder loads tend to have sealing trouble as hot powder gas cuts the lead. I'd say the longer conicals will produce better than short ones. Half a dz. good mold making companies out there. You may need to get a sizer to get them to fit bore snug but not hammer pounding tight! I think 300 grs. & up maxi-balls REAL's. Bunch more i just haven't went and opened up a book. Should be someone on here will add more and maybe better info.