Skopia
There really are not many options in a 44 cal sabot. The Harvester Crush rib being the thinnest. The next thicker one up would be the Harvester Regular 44/50 cal sabot follwed by the MMP HPH-.429/.430-50 green sabot.
Since I do not use 44 cal bullets, i do shoot an Omega, but I really can not tell you how they will fit the barrel.