I just got a Mossberg 835 deer/waterfowl combo. My question is about the slugs I can use in the 835 with the 3 1/2 inch chamber. I read in the past that you have to shoot 3 1/2 inch slugs through it. But the slug barrel states that its chambered for 2 3/4, 3, 3.5 inch, stamped right on the barrel. I'd really like to shoot 3 inch slugs out of it if all possible. Can you guys point me in the right direction? Thanks