I agree with MtnMan. If the Sims device is making that much of a difference, I'd first try a shim of some sort just back from the forend tip. Maybe a slice of an innertube, if only to provide a touch of pressure and maybe change up the dampening effect. I know a guy who is running a M7 in 260 and swears by his Sims, but I can't warm up to something like that on my rifle.

Now with even more aplomb