I'm looking to buy a shotgun for hunting. I already have a home defence shotgun. Anyway I need to know what exactly I need to get I'm assuming I'm ganna need a long barrel maybe 28inch? I'm looking at either a cheap mossberg 500 or remmington 870 12ga walmart has a sale on a cheap 500 for like $257 I was thinking of getting. I'm looking to deer hunt. And need to know what I need to shoot buckshot and slugs?