When I had mine, I hogged out the Tupperware stock and added some #9 shot sealing that in with expandable foam, trimming it down and reattaching the recoil pad. Tamed the recoil nicely. Did the same thing to a 450 Bushmaster that I built on an Axis action. That one was really beating me to death with 450 grain gas check bullets at 1650 fps.