Good questions StrayDog. Adding a pachmayr recoil pad will greatly effect the collector value of a pre 64 model 70. Just how much of a reduction in value depends on the model. To answer your next question honestly. NO, it is not fun shooting a 270 or 30-06 with a steel butt plate off the bench, but you won't notice it when you are hunting. Seeing how you are a "hunter", you should be fine with a steel butt plate rifle
. I'm also a hunter, but I do a lot of shooting from the bench so a pachmayr makes damn good sense. Especially on a standard rifle like a 270 or 30-06.