I have a survivor and the Ultra varmint stock, neither has a good recoil pad on it. The Ultra pad is better that the Survivor, but still way too hard. I checked the medium grind-to-fit Limbsaver, the narrow end is too small and the hole spacing is incorrect, so it won't work on the Ultra stock. For the weanie loads Poncaguy is shooting(sorry Larry :wink: ) the Ultra stock should work ok, but for heavy recoil, you're gonna be sorry. Should be fine for the 445SM, too.
edit: it was a medium limbsaver I tried.