Got a new Lee 50 cal 250 grn muzzle loader mold.made a 100 boolets and went to the range seemed they were real easy going down the barrel.They were flying all over the place..no group what so ever..When I got home i drove a boolit down the barrel and to measured it...very little marks.So hit the boolet with a hammer to make it bigger in diameter then drove that down the barrel..Measured it and its .5015 inches...the boolets this mold makes are .4970 inches..now i know why no grouping..Boolet isnt big enough..So my barrel measures .5015 should i buy a lee 50 cal .517 diameter ???? need info please