I guess all trial and error costs$.The Green Mt.aren't drop in fits as advertised and have 1-28 twist that may or may not $$$$ stabilize conicles ie:.54 Maxi-ball and Lyman .54 great Plains.No interest in Sabots in a traditional Muzzleloader.Why doesn't someone make a 1-32 twist and call it a day! Too easy I supose.........Harold