Are you sure that is a rifled barrel or is it a smooth barrel? A .730 is a 12 gauge barrel and that is the way I would think of that rifle. So even a 100 grain charge is like shooting a 3-3/4 dram of powder. That is what I shoot in my Knight TK2000 with 95 grains of shot. And that kicks like a mule. If the barrel is rifled, I would never go over 100 grains of powder and any projectile in it. Just for safety sake. Some of those You Tube videos are speciality weapons and they shoot insane loads. That would be a fun rifle to own and shoot, but very impractical due to weight to ever hunt with.