Choke for Remington
The only choke I use on my 870 is a TruGlo Gobble Stopper Extreme .665. At 40 yards it will put 196 pellets in an 8" paper plate. I've tried several loads and these results are with Hevi-13, 3", #7s. I don't have access to a longer shotgun range but with those numbers I'm confident I could cleanly take a turkey out to 50-55 yards. Hope this helps.