I have a Mossberg 500 12ga with a 18 1/2 barrel. I have be told by someone, that it's not advisable to shoot a slug through it. I recently found some HD ammo that has 3 balls & a rifled slug. Debating on going with that, or just stick to my 00 buckshot. Opinions on the ammo? Or the slug in a short barrel? Thanks in advance.