I have 0 smokeless powder experience in a 10 bore, but I surely burned a bunch of black powder in one.
The loads I used were for waterfowl mostly and pretty effective. Naturally, cleanup was a bit messy. I had Alcan brass shells and used about 150
gr of ff and a heavy(1.75 oz) of copper # 2s. Now I suppose one could come close with bismuth shot.