First off, let me say...I don't care what anyone else uses, as long as you pattern your gun and shoot within that guns limitations....2nd...Federal also makes a 2 oz load for 3 inch...thats what I shoot...in a 12 gauge 3 1/2 shell the load is 2 1/4...So we are talking about 1/4 oz more pellets...If you want to shoot 2 1/4 oz of pellets....I believe you would have a denser center pattern with a 10 gauge...Because you have a wider bore, less pellets are on the outside of the pattern (next to the barrel)..these are the pellets that would be on the outside of your pattern...And if you have patterned your gun and know where it shoots...these are not the lethal pellets...In other words what you want is a good, dense, center pattern and be able to deliver that pattern to the head and neck of a turkey....the same as patterning buckshot for deer....

With my 3 inch Browning B-80...I put 12-16 or so pellets into the head and neck at 40 yards, using Federal Premium 2oz 5s...and a Hastings .665 choke...I got lucky, I tried 4s, 5s, and 6s in both the Winchester Supreme and the Federal Premium turkey loads....with todays guns (I don't care if its a 12 gauge or a 10) If your gun wont place at least 10 pellets into the head and neck area of a turkey target at 40 yards then you have more work to do.....Heck, I have a 12 gauge double 2 3/4 that will put 8 pellets into that area at 40 yards using plain old Remington #6s...It accounted for at least 10-12 turkeys back in the late 70s-early 80s...

For my purposes 40 yards is far enough, thats why I've never spent my money on Heavy shot, etc...If I limit out too early, the wife seems to find more yard work to do...