All three of my Savages are stock rifles, for now. But, I pretty much only punch paper and I'm looking to squeeze every bit of accuracy out of the rifles. I neck size with collet dies, trim everything to the same length, measure every loaded case, etc. Once I get a ball caliper, I'll make the necks uniform. My accuracy goal is sub-0.5 MOA.
I guess the follow-on question is what do you do as the brass ages and you start discarding some? Do you stick with a dwindling brass supply, until some point, then go with all new?