Button vs cut rifling aside, 'to set the headspace more accurately'......?Button rifled barrels combined with the ability to set the headspace more accurately
Once the headspace is set, be it by factory, gunsmith, or you that's it. Providing you can close the bolt or or not blow the brass up that middle ground is what you have. After the 2nd or 3rd firing (maybe the first) your brass is (minus spring back) a copy of the head space in that chamber. I don't see accuracy being effected at all. Head space set correctly is for a safety reason and I see it having no bearing on accuracy at all.
I set my head space. I like to run as close to minimum that I can. (actually trying to set 3 rifles as close as I can so that I can achieve the ability (should it arise) to interchange bolts (which you really should not do unless you take the time to try and set them the same.)(something I picked up from Cortina should a bolt malfunction)
I'm talking Savage's, and I'm talking about my thoughts.
I find them to be the most accurate factory rifles and as to reason why I often wondered if the difference between tension (Savage) and compression (others) had anything to do with it. Barrell being pulled into the receiver as opposed to being pulled out. I'm in over my head with that.