If I may, I own a 10-Bore double SxS Paradox rifling. It takes about 230gr of Black and a wad to seat the slug to the proper depth. I would just say recoil is terrific. A gun maker friend had the cure. I went to a local upholstery shop and bought a square yard of 3/8th inch Jute padding. The rifle came with a wad cutter, so I just punched out a dozen to start and dipped them in Beeswax. A 900gr bullet, 125gr of Fg, and four wads makes a load that is not unpleasant for half a dozen rounds offhand.
Rich