I also replaced the recoil pad on my .450 with one from Limbsaver which is nothing short of exceptional. All of the 450's are now regulated with Hornady ammo. Not sure about the other calibers though. If you buy from Cabelas they are usually posting a picture of the final regulation target and the load will be written on the bottom of the page. If not, call the store and they will pull the target and tell you what ammo was used.