Originally Posted By: ColoradoHillBillyI had this happen on a ruger 220 swift. We wanted accuracy as well, but when we neck sized, the bolt would seldom close, so full length sizing was the answer. When the bolt quit closing on loads, the cases were in need of trimming, however we rarely trimmed the case because when we trimmed them, one firing was all we could get and the case would split. 220 swift cases are the shortest lived case I've ever reloaded, but they are cool. We quit trimming because it wasn't worth the time to trim, measure, and deburr for one shot, we baught more cases. I bet your gun is fine, just remember that the swift was the first factory round to break 4000 fps, done by loading to very high extreme pressures.
Annealing your brass will solve this problem and save you a few $. Brass gets work hardened after a few firings especially in high pressure applications like the Swift. It becomes brittle and loses its elasticity, hence the cracking. I have Swift casings with over a dozen firings on them. Hope this helps
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