BudsGunShop.com - Rifled barrel

John, this has a smooth bore Barrel. For the first 200-250 rounds I'd stick to standard or high velocity rounds. After that you can shoot just about anything. This will shoot bird shot, buck shot or slugs. Since this has a smooth bore rifled slugs will have the best accuracy. This has a 3 inch chamber so it will fire 2-3/4 inch and 3 inch shells. Hope this helps.

John, it is a smoothbore barrel, it will shoot different types, (slugs, buckshot, birdshot) but you need high velocity shells (at least 1300 FPS) for this to cycle properly. Yes, there is a break in period, about 250 rounds. Will shoot 2 3/4" or 3" shells. Even after break in, owners manual clearly sates to use high velocity shells. I can attest from personal experience anything under 1300 fps will not cycle. Stay away from Aguila 2 3/4" shells, no matter the velocity, they jam in mine every time. You will love this shotgun, I have one and it's by far my favorite shotgun to shoot.