I use a Hastings .640 on my Browning B-80...I can put 16-18 pellets in a turkey head/neck at 40 yards, load is Federal Premium 3 inch mag 2 ounce number 5s...I use the older loading without the Flight Control...

The local gun shop recommended this choke for the Browning with Invector chokes as he had sold one to another customer and he was getting good patterns...

Can't say its the "best" as its the only one I have...