I have Remington brass for the 204 Ruger. After 3 or so resizings split necks start showing up. Not more than 2-3% each time. My gun hates neck sized brass so they are full length sized only.
I looked into annealing cases and to do it right is a bit more difficult than merely heating the case neck and dropping them in water. I would do a forum search here and on the Internet. It is easier for me to buy a bag of brass. YMMV
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