I just bought a Mossberg 500 3 in1 the other day. It came with the 28" deer barrell and the 18 1/2" home invasion barrell. I know what i can use with the home invasion, but am wanting to know what ammo i can shoot in the 28". I have heard people say you can only shoot certain types of slugs through it. I am not trying to ruin what i have. So if anyone can help me out i woould appreciate it. I am wanting to deer hunt with it this year so i need to know what i can shoot. Thanks