My Winchester SXP, 23" barrel, with a Trulock .650 made for Federal TSS #7, using Federal TSS #9 works well out to 60 yards.
The Trulock .650 is made for Federal TSS #7 and works well, but the extra pellets in Federal TSS #9 1 3/4 oz has me hooked on #9's.
Trulock recommends their .640 for the #9's. I ordered one when they had their Memorial Day sale to see what it will do. It is advertised to put 400 pellets in a 10" @ 40 yds. I am guessing that is with Federal TSS 3 1/2" #9, 2 1/4 oz. I should get 300 pellets in a 10" @ 40 with the 3". We will see.
With the Trulock .650 3" 1 3/4 oz @ 40 yards, I've gotten 205, 204, and 225 pellets in the 10". The one that put 225 in the 10" put 620 (out of 633) in the 30". Good-looking pattern. The same makes a 9" pattern at 20 yards.