I see a huge improvement with .001 neck tension with my rifles. Some rifles of quality don’t need it. They don’t need to be glass bedded, or free floated barrels. Feed it anything, factory or standard loading and they shoot great.Don't get hung up on all this measuring and chamber dimension. Tinker with powder type charge, overall length and jump. You probably won't see much improvement with neck tension, just go witth 0.002" tension.
Check out the load map stuff on this website:
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