I anneal every 5 firings. If I go longer than that, I can start to see some marks on the neck I'll 'fatique', for lack of a better term, and then soon after comes neck cracking. I've found this to be the case with Rem 300RUM brass and 338 Lapua brass, although I've not cracked a Lapua caseneck, though I see the same markings start to appear on these as on 300RUM brass that then will start to crack a couple of fireings later. As much as cracking is an issue, another issue avoided by anealing is work hardening of the neck to the point that it won't form well when sized. Experiences and milage may vary, but I've persoannly found that annealing every 5 firings seems to keep things running pretty smoothly overall. Just me--there's many on here with muchmore expereince than I...
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