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Message: <blockquote data-quote="swampratt" data-source="post: 3336691" data-attributes="member: 15054">I anneal every time on rifle cases.I have tested annealed vs not annealed. I like to pin tumble the cases  in my solution with copper pins and brush necks before and after sizing the case.Every time on that.I have tried hand cleaning no tumbling and accuracy is less with hand cleaning.I trim and chamfer each time for accuracy bound ammo.If it is a brass fail test just shoot a piece of brass to fail point I will forgo many steps and I will let the case grow to the point it is almost in the rifling. That is usually .035" past max trim length.I Full length size my cases also.Another thing I do is hone/polish my dies so i am not reducing the case size more than .002" anywhere.Well except for the neck OD area.Push the shoulder back 0000 or .001" makes cases grow much less.Neck sizing I have measured case length growth on the order of .0005" for the first couple firings.After 5 firings and Only neck sizing the case becomes a bit harder to chamber.Some will then Full Length size.That makes Zero sense to me.. now the case is way off from the dimension it was when neck sizing.Now i tested neck sizing past 5 times sized.. and the case now only grew in length .0005" for 2 firings.I neck sized a particular .308 case 20 times and it was no harder to chamber at 20 times than it was at 5 times.Leading to the conclusion that after 5 times fired and neck sized the case is bumped up solid into the chamber.One last thing..308 winchester cases I was bumping the shoulders .008" back and I had not begun measuring that aspect and the cases would grow quite a bit .. always knocking .005" or more off the length and chamfering again.Once I began setting the die to just barely bump the shoulder it made case length growth much less.BUT BUT BUT!!! My accuracy fell off.Yea less accuracy even after many months of tailoring the load.I could also never get the accuracy from neck sizing that i could from full length sizing.Thinking about that made me remember many writings on wildcat fire forming.What they wrote was super accuracy with the loaded case during fire forming and after fire forming the loads could not match the fire forming loads.Is there accuracy to be had pushing that shoulder way back. I believe there is and you will sacrifice brass life to find that out if there is accuracy in your rifle by doing it.I do notice larger groups if i mix cases that have different shoulder ogive measurements.Just another parameter in case prep to drive ya nuts.You are welcome.</blockquote>

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