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Rifles, Reloading, Optics, Equipment
Reloading
Flattened Primers? Help?
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<blockquote data-quote="Bart B" data-source="post: 566381" data-attributes="member: 5302"><p>All of my rimless and belted bottleneck cases are shorter after firing than before. Their case mouth is further back towards the case head after the case is fired. Sizing only the neck back to what my full length sizing dies do lengthens it a tiny bit, but not as much as full length sizing the body, too.</p><p></p><p>I've shot several hundred "proof" loads in 7.62 NATO chamberd Garands (LC case & primer, 42 grains of IMR4475, 172-gr. bullet) that peaks at about 65,000 CUP, 83,000 PSI) and their primers were only slightly more flattened than the same load with a 147-gr. bullet (a standard M80 round producing 50,000 CUP, 58,000 PSI). No case head extrusion into the bolt face's ejector hole nor extractor cutout either. For all practical purposes both loads' case heads looked identical except for the slightly more flattening of the proof load's primer and it took a magnifying glass to easily see the difference.</p></blockquote><p></p>
[QUOTE="Bart B, post: 566381, member: 5302"] All of my rimless and belted bottleneck cases are shorter after firing than before. Their case mouth is further back towards the case head after the case is fired. Sizing only the neck back to what my full length sizing dies do lengthens it a tiny bit, but not as much as full length sizing the body, too. I've shot several hundred "proof" loads in 7.62 NATO chamberd Garands (LC case & primer, 42 grains of IMR4475, 172-gr. bullet) that peaks at about 65,000 CUP, 83,000 PSI) and their primers were only slightly more flattened than the same load with a 147-gr. bullet (a standard M80 round producing 50,000 CUP, 58,000 PSI). No case head extrusion into the bolt face's ejector hole nor extractor cutout either. For all practical purposes both loads' case heads looked identical except for the slightly more flattening of the proof load's primer and it took a magnifying glass to easily see the difference. [/QUOTE]
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Flattened Primers? Help?
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