With a shotgun it really doesn't matter to me, because I don't shoot trap. I buy the cheapest case (500 rounds) of #7 or 8 and head to the state game land, then set up some old soda cans or milk bottles or whatever, then blast away at various ranges.
Remington reduced recoil buckshot and slugs for self defense.
S&B Buckshot for stocking up, because its cheap.