I patterned my Super Vinci, M 1, and 870 Super Mag last year and to be fair bought several different kinds of shells for each of the guns. They consisted of Kent Diamond Shot 3 1/2 #5, Winchester Extended Range 3 1/2 #5, Federal Premium Flight Control 3 1/2 #6, and the Mag Blends from Hevi Shot in both a 3 inch and a 3 1/2 inch shell. I have a Kicks choke on the Super Vinci, I believe it is .655, a similar Jelly Head on the Benelli M1, and a Jelly Head on the 870 Super Mag.
My best patterns out of all the guns were with the Hevi Shot blends, given the M1 would only shoot 3 inch shells so I didn't shoot anything else through it. However, the Kent Diamond shells were the worst patterning shells out of the group, by far. After about 30 yards they for the most part lost any type of uniformity and just went all over the target. Now, that's not to say that they would not kill a turkey, but they did not pattern well when compared to the competition.
I don't believe that I got over 100 hits in a 10 inch circle at 40 yards with the Kent 3 1/2 shells compared to 250-260 with the Hevi blends and around 200 with the Win. Extended range.