The choke that works best for my sd 12 gauge is the regular Remington modified, it throws twelve 000 buck pellets into a 5"X7" pattern at 21 yards, dead in the middle of both furthest distances i can see in the house, for those that load or looking to load in these ammunition scarce times i cast the.360" diameter balls from 22 BHN alloy from a Lee Gang mold, four rows of three balls dropped in over a max dose of 800X compressed 50lbs with a winchester over powder wad in the clear 2-3/4" fiocchi hulls, no shot wad, it isn't needed, the load clocks just under 1200 fps.
A hell of a payload from a 2-3/4" hull, and one i'm sure would do the deal at 50 yards and beyond, 11 rounds of that super hard shot on board the old 870 is quite comforting, it just leans against a wall and waits.
