either option is going to beat the new home defense shotgun loads of BBs any day, that mass x momentum thing and all.
if you use full power magnums, its going to be a handfull, so will the judge. its simply getting a weapon you can shoot well, get ammo for as cheaply as you can.
38 specials will beat both 45 colt, .410, and 357 magnum ammo in that.