I have a 1968 model 37 that shoots great. I only shoot standard pressure loads, LRN 158 grain, and I shoot a lot of them. If you keep it clean and don't shoot hot loads in them, I think they last just fine. Mine has made it 44 years and is still tight and dependable. I like the light weight and the feel of the original magna RB grips. I wouldn't trade it for a brand new one. I got it for $200 and a Raven .25.