I would ask Luke what works best. After all he made that Arrowhead breech plug system. a Friend had Luke make him a custom 45. I met Luke at his shop and after talking for a while I realized he sure knows his stuff.
Regarding the Rem Ultimate Muzzleloader. The lands are higher in this rifle. .5015" The green sabots that are packaged with 250 gr accutip bullets are specially made for this rifle. Talked to Barnes and tech said they worked with Rem to make a special package for this rifle.
From my notes: "mmp makes the sabots for the Remington 250 gr bullet 25-30% more tensile strength than other sabots." I have found a few at the range and the bases are certainly altered by the high pressures made by this rifle. Not sure how well other sabots will do.
