Trim length tolerance?
Total neck tension and release of bullet from the neck include several factors. Case neck wall thickness, concentricity and consistent annealing will have more effect than .003" variance in case length, assuming you are not crimping.
I don't get that much variance using WFT so you might check whether the case holder that the shoulder butts up to is getting brass shavings in it. I periodically wipe it clean with a Qtip.
Since the WFT indexes off the shoulder, you want to make sure all the brass being prepped in that batch went through the exact same sizing die and setting.
It is also easy to get going a little to fast and remove the case before it is perfectly trimmed. I try to pause an extra second or two after I think it is done just to make sure the cutter is done.
Also, if you over chamfer or debur you might shorten the neck by a couple of thous.
Last edited by NWPilgrim; 04-07-18 at 17:58.
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