Re: Redding competition necksizing bushings....Help!!!!
I am assuming that your case necks are all the same thickness(within 0.001")If not, its a good idea to neck turn your cases for better uniformity, or get brass that has better specs.
In theory, you want to measure the diameter of your bullet (say .308") and the wall thickness of your case necks (say .013")
Add the bullet diameter(.308)to the neck wall thickness (.013") x2 (=.026"). So .308" +.026" =.334". This should also be the diameter of the neck of a loaded case, assuming my dimensions are correct.
You want to have the bushing undersized by .001" or 002" to give you some neck tension and to allow for some "springback" in the brass.
So when you order bushings, its a good idea to get bushings .001", .002" and even .003" undersized.
Also, a good idea to measure the diameter of different make bullets, as they sometimes can differ in diameter, though not a lot.
Hope this helps [img]/ubbthreads/images/graemlins/smile.gif[/img]
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