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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 Norma vs 300 Norma Imp
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<blockquote data-quote="Swamplord" data-source="post: 1570568" data-attributes="member: 2460"><p>When you fireform into the improved versions, the over all length of the case gets shorter as material is pulled back to fill the new dimensions/shoulder angle, leaving you with a case length much shorter than the 2.492" trim to length (2.502" chamber depth) standardized for the original 300 Norma Mag and used for wildcats</p><p></p><p>Based on the improved body dimensions of my cases that pull back more material to fill new chambers, I haven't seen the need to ever trim when using Norma brass, typically primer pockets let go before trimming is required</p><p></p><p>With the new Peterson and Lapua 300 NM fireformed into my wildcat versions it's the same deal so far at 4 firings on cases except the primer pockets are still good , where the Norma brass would show loose pockets and be culled before trimming becomes necessary</p><p></p><p> with the harder case heads retaining integrity of primer pockets on the Peterson and Lapua brass I will most likely encounter trimming at some point in the next few firings but haven't yet got there</p></blockquote><p></p>
[QUOTE="Swamplord, post: 1570568, member: 2460"] When you fireform into the improved versions, the over all length of the case gets shorter as material is pulled back to fill the new dimensions/shoulder angle, leaving you with a case length much shorter than the 2.492" trim to length (2.502" chamber depth) standardized for the original 300 Norma Mag and used for wildcats Based on the improved body dimensions of my cases that pull back more material to fill new chambers, I haven't seen the need to ever trim when using Norma brass, typically primer pockets let go before trimming is required With the new Peterson and Lapua 300 NM fireformed into my wildcat versions it's the same deal so far at 4 firings on cases except the primer pockets are still good , where the Norma brass would show loose pockets and be culled before trimming becomes necessary with the harder case heads retaining integrity of primer pockets on the Peterson and Lapua brass I will most likely encounter trimming at some point in the next few firings but haven't yet got there [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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300 Norma vs 300 Norma Imp
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