Quite frankly, the 3 1/2" loads on average pattern like crap IME. Let alone want to dislocate your shoulder.....
I recommend buying 10-20 rounds of the Remington yellow box #4 Buck, in 2 3/4 and what I shoot the 3". You might have to experiment with a couple of choke tubes to figure out what tube patterns the best for your gun. Just like working a load up in a rifle.
IME absolutely no need for the big honking 3 1/2" shells or the Hevishot stuff (which is excellent BTW if you like spending $). Those who expell the 3 1/2" virtues generally have other recompensation problems. The shotgun sweet spot is no more than 3". YMMV...
I hammer coyotes with yellow box 3" and I mean tumble them head over heels out to 60. Past that usually require a finisher but that's damn good for shotgunning coyotes which is about all I've done for the past 8 years or so. My load will put 4-6 #4 buck pellets on a 12" plate out to 65 or so.
