With a rifle as lite as a Kimber you will know it's going off, especially if using 150gr bullets.
In my Featherweight with Mcmillan stock you get a noticeable increase in felt recoil going to 150's. It has a very narrow recoil pad/butt area. With 130's I don't notice it being much different.
If you are close to Carrollton PM me and you can come shoot mine sometime.
Mike