Pachmayr makes a pad called XLT "Ultra Soft" Magnum. Don't know if it would fit your application or not, but worth a look. A good pad will reduce the sharpness of heavy recoil and spread it out over time, not reduce recoil like a break will.

"The revolutionary new Ultra Soft pad that Shooters and Gunsmiths will love! Finally, after years of research and testing, Pachmayr engineers have developed a trap pad that's almost 50% softer than the legendary Pachmayr Decelerator. Even better, the new super soft formula has the smooth grinding and installation characteristics of our popular Decelerator pads."


http://www.pachmayr.com/home/XLT-magnum-traps.php

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