My slug gun is an Ithaca Deerslayer II with a Nikon Prostaff 3 x 6 and Winchester Platinum tip 400 grain sabots.
My muzzleloader is a TC Encore in 50 cal. with a Nikon Buckmaster 3 x 9 and TC Shock Wave Sabots, 250 gr. 100 grains of Triple 7. Also have a TC Omega that just sits in the gun safe these days.
I put a limbsaver on the Ithaca as it's a pretty light gun and kicks hard. That seemed to solve it.
Keep life simple...if you hear hoofbeats, think horses, not zebras.