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Question for Dasher or 6BRA shooters: What is your preferred loaded round neck to chamber neck clearance?

I note with interest in"the book of Rifle Accuracy", Tony Boyer dedicates a chapter explaining how to neck turn to a total loaded round clearance of 0.0015!!
He then goes on to say that a case fired 3 to 5 times should be able to have a bullet inserted before sizing. He recommends that if you can't insert a bullet the case should be turned a little more (in increments of 0.0002) until it does!
That's pretty tight but I suppose Tony knows what he's talking about.
 
I'm not familiar with a Dasher or a BRA or any other variant. I shoot a 6PPC. I have found the tighter clearance the better. I've never measured but I can tell you that after a case is fired in my rifle I can seat a bullet with my bare finger and the case still holds it.
 
When I got the reamer for my Dasher, it had a .2704 neck, supposedly no-turn Lapua Blue Box. My loaded rounds are .268 so my total clearance is .0024, it works, never had a problem and I’m on barrel number 3. Buying some Peterson brass caused me to turn the necks as they, unturned, made loaded rounds .269, .0014 total clearance, a bit too tight. If I order another reamer, it will have a .272 neck
 

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