I recommend you use the largest shell/GA combo that you can handle the recoil. Sometimes the 3.5 inch 12 GA can make the difference if a nice tom hangs up.
As you know, like all shells you need to try them out in your specific gun/choke to see what patterns best. Some combinations shoot the Federal Mag-Shok Flitecontrol's really well, other guns/chokes are too tight for the flitecontrol special wad. I tried the flitecontrols in my shotgun/choke and I was picking the wad out of the target at +35 yards.... a little too tight.
I just returned from an ice fishing trip in Minnesota and one of the guys in our party is a ballistics test technician for Federal Ammo. He shoots shotguns and rifles for a living!
He has seen some great results from both the Mag-Shok flitecontrol shells and also the Black Cloud waterfowl shells which use the same wad design.
