I tried one in my 870 with a 21" barrel, and it shot well with hand loaded tss #9s. It liked the Carlson's 575 a tad bit better, but still shot very well with that choke. Both of these chokes shot better than an more expensive Indian Creek choke. My son's gun liked the Primos Tightwad better. I would try this choke, and then go from there. Good luck.