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Rifles, Reloading, Optics, Equipment
Reloading
6.5x284 Norma
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<blockquote data-quote="dok7mm" data-source="post: 2577275" data-attributes="member: 90080"><p>A quick way to check headspace after 1st firing.</p><p></p><p>1. Measure base to datum on 1st fired case, with primer removed, using comparator. Write it down.</p><p></p><p>2. Take a spent primer and barely seat it by hand into same case's pocket. Chamber it and close bolt. Extract it and measure shoulder datum to primer bottom using comparator. Write it down.</p><p></p><p>3. If # 2 is longer than #1, the difference is lacking full headspace from first firing.</p><p>If #1 & #2 are the same, the first firing was full headspace and you can proceed with your bump.</p><p></p><p>Because there's some slight differences in 1st fired cases, I'll check 5-10 cases to get a good average. This method can also be used to check new brass against your chamber shoulder length, but once again there will be some differences in case base to datum from factory.</p></blockquote><p></p>
[QUOTE="dok7mm, post: 2577275, member: 90080"] A quick way to check headspace after 1st firing. 1. Measure base to datum on 1st fired case, with primer removed, using comparator. Write it down. 2. Take a spent primer and barely seat it by hand into same case's pocket. Chamber it and close bolt. Extract it and measure shoulder datum to primer bottom using comparator. Write it down. 3. If # 2 is longer than #1, the difference is lacking full headspace from first firing. If #1 & #2 are the same, the first firing was full headspace and you can proceed with your bump. Because there's some slight differences in 1st fired cases, I'll check 5-10 cases to get a good average. This method can also be used to check new brass against your chamber shoulder length, but once again there will be some differences in case base to datum from factory. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
6.5x284 Norma
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