im not sure yet if i will go with either a .562 or .570 mold. Right now its loving 100gr RS with a .531" ball wrapped in a .040 patch. It shoots way low, so that tells me its just not building up the pressure that it needs. I'll buy the mold as soon as i make up my mind. I hear .562 is an accurate ball vs the .570 but hell, i will probably end up buying both.