I shoot a 270 . I bought the Remington managed recoil rounds so my 12 year old daughter (82 lbs) could use the gun. She has killed a doe with a 30-30 but does not like the recoil. Not that it hurts her she just does not like to practice with it.
When we tried the managed recoil rounds in the 270 we both agreed that it felt less than the 30-30. Both guns have a slip on limsaver recoil pad now and she is fine with shooting both.
Overall we still both think the recoil on the 270 with the managed rounds is less. If I had to estimate it would be 25% less.
As far as accuracy i found that after shooting regular Remington factory loads then switching to the managed recoil rounds the groups move about 1/2 low and 1 inch right.
Basically my daughter now has 2 guns instead of one with no extra cost