I put the coated screws up there to hold my Encore, which I leave there all season. It's wearing a .223 heavy barrel for fox/coyote/bobcat/etc. I hate shooting small critters with regular calibers. I also have two .25-06 hulls with the primers drilled out for 3" screws above the door for a gun rack....
And here's the one I had for while I'm hunting, though I've since changed it up a bit....
And yes, I have a swivel seat!