You'll have to experiment with your gun and choke and see what it likes. There's no magic rule that applies across weapons.
That being said, Federal does make some nice patterning buckshot and I would try it first. There's a 3" Flight Control 00 round made for deer hunting. It's put meat on my table at 40 yds + a few steps. I've never shot it from my 835 though, only my 870's and 11-87.
NC Hunter's Education Instructor
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