Hi St B,
I have used the Remington MRL's in my 270. I bought them so my Daughter (was 13 then) could use the gun. The recoil reduction was substantial. They advertise 50% and I would have to say that is fairly accurate. I now own a 243 and I would say that the recoil is similiar to the 243 using the 270 MRL's.
I also have a sims Limbsaver pad and when used in conjuction with the MLR's the 270 is very mild and pleasant for her to shoot.
In fact I left the limbsaver on for myself and i really do like it. It works great for recoil reduction on the full loads