While the Pachmyer pad doesn't suck up as much recoil as the others, its not going to be a huge difference from one to the next. A
muzzle brake is going to do the most for you. My RUM is wearing a decellereator AND a Centershot Muscle Brake and it's like shooting a 308. As others have mentioned, the limbsaver pads seem softest but I stay away from them due to the deformation issues. You will notice a difference going to one of these other pads but I would recommend putting a brake on it if you really want to soften it up.
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