I bought a container of the India made 410 cartridges with a lead ball measuring right at .409. The lead seems soft, but I don't have a gauge to measure hardness. My question is will this be safe to shoot in my Baikal SxS I slugged the bores and they are .018 (.391)smaller in diameter than the ball from the cartridge. Surely full choked.The barrel thickness at the muzzle is thicker then my other 410 by quite a bit, and measure .081 each.