OOPs almost forgot in my last post I didn't mention the fact that I sent my 300 Rum to Answer Products who guaranteed to reduce the recoil to that of a 270.
YES it works as advertised. My 15 year old shoots deer with it with no problem.
I did shoot all my Rums before having brakes and pads on them and without them don't know if (I) would use(Hunt) these without.