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Rifles, Reloading, Optics, Equipment
Reloading
.257 STW question - crimping
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<blockquote data-quote="Rum River" data-source="post: 279525" data-attributes="member: 16869"><p>Based on pjracer's reply, and the comments on other threads I found while searching, I opted not to crimp.</p><p> </p><p>The expander ball miked .255", and the bullets were averaging .256". The owner had purchased 200 rounds of unfired Winchester brass. Miking case thickness at the case mouth revealed inconsistencies that aggravated the case neck tension issue.</p><p> </p><p>I removed the expander ball, chucked it in the drill and used polishing stones to remove just over .001".</p><p> </p><p>I pulled down one of the cartridges I knew to have too-little case neck tension, resized it with the modified expander ball in place (after removing the decapping pin) and reassembled the cartridge.</p><p> </p><p>Now I can feel tension when seating the bullet, before there was no resistance at all.</p><p> </p><p>Now I have to back up and re-shoot the last series of test loads to make sure my pressures are okay.</p></blockquote><p></p>
[QUOTE="Rum River, post: 279525, member: 16869"] Based on pjracer's reply, and the comments on other threads I found while searching, I opted not to crimp. The expander ball miked .255", and the bullets were averaging .256". The owner had purchased 200 rounds of unfired Winchester brass. Miking case thickness at the case mouth revealed inconsistencies that aggravated the case neck tension issue. I removed the expander ball, chucked it in the drill and used polishing stones to remove just over .001". I pulled down one of the cartridges I knew to have too-little case neck tension, resized it with the modified expander ball in place (after removing the decapping pin) and reassembled the cartridge. Now I can feel tension when seating the bullet, before there was no resistance at all. Now I have to back up and re-shoot the last series of test loads to make sure my pressures are okay. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
.257 STW question - crimping
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