Hello,
I have been experimenting with lee minie bullets in .575 diameter with my 20 gauge shotgun and using them as wad/sabot slus.
the best load i have came across as far as accuracy goes is 22.0 grains blue dot, waa20 wad, win 209 and a federal paper basewad plastic hull that comes in the value pack ammo.
i need to order a bag of the BPI trap commander wads. the few i tried looked really good and fit the slugs the best.
BTW, the gun is a mossberg 500 with a 26 inch barrel, cyl bore choke. at 40 yards the slugs are still point first but are starting to yaw. a rifled choke tube is on its way.