Quote:
Originally Posted by marxman
I set my dies to land on the shell holder and if i had your problem i would say its the chamber
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I disagree with this opinion, of both proper die adjustment, and probable cause of the OP's problem.
IMHO the OP's head separation problem was most probably caused by adjusting his FL die exactly as marxman does (and most instructions direct).
This adjustment will result in a case sized to SAAMI minimum (or possibly much smaller).
It will allow the resized case to easily chamber in any SAAMI compliant chamber,
but probably with excess headspace that WILL shorten case service life, and may cause head separation, and also require frequent trimming.
(When trimming, always ask yourself, where did the brass you are trimming off come from?)
I suggest a check of the fit of a resized case in your chamber,
then apply layers of tape to the base of the head until the case is too long for the action to close.
A headspace GO gauge can be used similarly to determine actual chamber length, which can be compared with the SAAMI spec.
Many of those desiring maximum reliability of chambering prefer very small case sizes, and are willing to accept lower precision and case life.
Target shooters not so much.
I suggest a forum search on "partial sizing" or "die adjustment" or similar.
Good Luck, YMMV.