Have a Winchester pump & well, its kicks harder than the SuperX auto I used to have, that's for sure. WAs spoiled by that SuperX, I tell ya. Just my opinion, but the Standard pad that comes with the Winchester pumps might as well not, for all their worth! HAd a cop buddy who used to go shooting with me & I'd complain all the time about the "punch" on the shoulder. He'd laugh; call me a wimp.
Anyway, I know I didn't like putting 4-5 boxes of 3" slugs thru it! Ouch. Sore shoulder time later.
Then I bought the `Limb Saver' (
http://www.limbsaver.com/limbsaver/fire ... earms.aspx). HAd it mounted, with a mercury-filled recoil reducer in magazine end. The Limb Saver supposedly can tame even the Big Guns (Safari hunting). Hey, it cost less than a Pachmeyer, too. I remember my Gunsmith looked at it & said "what the H#$% is this?" He'd never seen that brand before either. Told him one of those new Hi-tech materials.
BAck at the range: It worked! Wow.

U feel the gun move, that's for sure. But no "ouch" when it kicks back. No more flinching after a box or two anymore either. In fact, can shoot all afternoon now without a hitch. So, I'm convinced!
PS: I'm sure the recoil-reducer didn't hurt none, either. My next step: Vangcomp the barrel. I just hate recoil!