I use a Rem. Superfull choke (.667") and Remington Nitros #5 1 7/8 oz. shot with 90-110 pellets in a 10" circle @ 40 yds out of an 870. My father has a shorter barreled 870 and his shoots best with a Primos Tightwad and Winchester Extreme #5 1 7/8 oz. shot and his shot count is similar to mine; if a little tighter at 20 yds.
We both tried the Federal Fight control round and found a very even distribution of pellets from 15-40 yds but were disappointed with the 'down range' density of the pattern. Although, it is cool seeing the neon orange shot-cup travel down range, almost like having a tracer round.
Both chokes were $20 a piece.
Good luck to you this year!