I just recently became a shot gun owner, so i`m not sure at all of what to use. I got a used Mossberg 500 with a 28" rifled barrel and a new H&R Pardner with a 18 or 18.5" smooth barrel. Both are pumps. There are so many different kinds and types of ammo out there, that it is really confusing on what to buy. Suggestions sure would help. Thank you.