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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Case head separation with new Browning X- bolt 300 win mag.
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<blockquote data-quote="quigley257" data-source="post: 2888627" data-attributes="member: 84442"><p>Very common for belted mags to stretch a LOT on first firing just above the belt. If you use a case comparator to measure virgin brass versus once fired brass, the amount of movement on the shoulder datum line can be huge. I like the Peterson "long" 300 Win Mag brass for this exact reason. While your rifle may indicate perfect headspace while using SAMMI spec gages, the measurement from the bolt face to the shoulder datum line can vary wildly from manufacturer to manufacturer on belted rounds. This is easily seen by measuring a handful of factory 300 Win Mag ammo with a case comparator and noting the differences in length(to the shoulder). It is not uncommon to have well over .015" increase in base to shoulder length on the first firing. All that stretching has to occur somewhere, and it usually manifests itself just above the belt as shown in the OPs photo.</p></blockquote><p></p>
[QUOTE="quigley257, post: 2888627, member: 84442"] Very common for belted mags to stretch a LOT on first firing just above the belt. If you use a case comparator to measure virgin brass versus once fired brass, the amount of movement on the shoulder datum line can be huge. I like the Peterson "long" 300 Win Mag brass for this exact reason. While your rifle may indicate perfect headspace while using SAMMI spec gages, the measurement from the bolt face to the shoulder datum line can vary wildly from manufacturer to manufacturer on belted rounds. This is easily seen by measuring a handful of factory 300 Win Mag ammo with a case comparator and noting the differences in length(to the shoulder). It is not uncommon to have well over .015" increase in base to shoulder length on the first firing. All that stretching has to occur somewhere, and it usually manifests itself just above the belt as shown in the OPs photo. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Case head separation with new Browning X- bolt 300 win mag.
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