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I am not quite sure what you want to do. There are lots of buttpads/buttplates available. There are adjustable buttplate mounting systems. All sorts of casting epoxies.
I've always just gone with a grind-to fit Pachmayr Decelerator pad. They work great, and they are super comfy. I tried a Limbsaver pad on one rifle, but it wouldn't grind properly and looked terrible as a result.