I shot some 3.5" magnums out of my Supernova Tactical. Mostly Win Super X 3.5" 18 pellet 00 buck. I'm not recoil shy but it was brutal. At 20 yards only 8 or 9 pellets hit the target, the rest peppered the backstop. I believe that shotgun was 8 or 9 lbs unloaded the way it was set up. Now having fired a number of 3" mags out of light singles I'd have no interest in stepping up to a 3.5". Unless you like sore shoulders, bruised cheeks and whiplash. Mind if I ask what you have in mind for such a boomstick? Not trying to be rude, I'm genuinely interested.