You'll likely get several recommendations and it'll all be good advice. My guess is any good quality choke will throw acceptable patterns out of your gun. However, what's best will depend on your gun, the load (and even the lot), and the choke. So, it may take as much experimentation as your wallet and patience will allow. While none were M1s, a Rhino .660" has thrown the best patterns with the load your shooting out of three different Benellis I've tested.