RE: Mossberg 835
12 pointer,
835's are backbored, so usually chokes that are not as tight work better in them. I would say a choke between .690 and .675 would work well with 5 shot.
I like my Com-N-choke. I use 6 shot and my choke is either .670 or .675, But Com-N-Choke's are not made for Hevy shot either.