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Rifles, Reloading, Optics, Equipment
Reloading
The importance of case trim
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<blockquote data-quote="fiftybmg" data-source="post: 1645172" data-attributes="member: 96316"><p>I was zeroing my 308 Norma at 200 meters after adjusting the position of the rings. The load is with a 155 A-Max, approaching the high end of the load spec, and is accurate.</p><p></p><p>Only the windage was affected by the adjustment, all the shots were around the horizontal center. It took 4 shots to get to zero, and shot five was the final confirmation, which went 4 inches high at 200 meters.</p><p></p><p>I knew straight away there was a pressure problem. That shot went where the lighter weight monos go at 3400 fps. I suspected that I had made a mistake and dropped too much powder. </p><p></p><p>Bolt was stuck, but opened with hand pressure, stripped the rim, leaving the case stuck in the chamber. I tapped it out with a cleaning rod.</p><p></p><p>It measured 8 thou over max trim length. The base of the case just ahead of the belt had expanded over 20 thou.</p><p></p><p>I pulled all the ammo from the batch, checked the charge weights, and they all checked to within 0.1 grain. Checked case lengths. I had several cases 6-8 thou over trim length.</p><p></p><p>Mentally retracing the steps, I remembered being a few rounds short for what I needed on the day , so I took half a dozen fired brass, resized, and loaded without checking the case length.</p><p></p><p>Trimmed, loaded, went back the next day, and completed the zero uneventfully.</p><p></p><p>Lesson learned.</p></blockquote><p></p>
[QUOTE="fiftybmg, post: 1645172, member: 96316"] I was zeroing my 308 Norma at 200 meters after adjusting the position of the rings. The load is with a 155 A-Max, approaching the high end of the load spec, and is accurate. Only the windage was affected by the adjustment, all the shots were around the horizontal center. It took 4 shots to get to zero, and shot five was the final confirmation, which went 4 inches high at 200 meters. I knew straight away there was a pressure problem. That shot went where the lighter weight monos go at 3400 fps. I suspected that I had made a mistake and dropped too much powder. Bolt was stuck, but opened with hand pressure, stripped the rim, leaving the case stuck in the chamber. I tapped it out with a cleaning rod. It measured 8 thou over max trim length. The base of the case just ahead of the belt had expanded over 20 thou. I pulled all the ammo from the batch, checked the charge weights, and they all checked to within 0.1 grain. Checked case lengths. I had several cases 6-8 thou over trim length. Mentally retracing the steps, I remembered being a few rounds short for what I needed on the day , so I took half a dozen fired brass, resized, and loaded without checking the case length. Trimmed, loaded, went back the next day, and completed the zero uneventfully. Lesson learned. [/QUOTE]
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The importance of case trim
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