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Rifles, Reloading, Optics, Equipment
Reloading
Looking for some feedback on primer seating tools
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<blockquote data-quote="Hugnot" data-source="post: 2708985" data-attributes="member: 115658"><p>I use a Lee press mounted priming tool. I have 2, large & small primer. I am satisfied with both, and seating depth is controlled. I seat primers so anvils touch, the Lee tool limits primer seating depth being adjusted for primer pocket depth.</p><p></p><p>Of intertest:</p><p></p><p>[URL unfurl="true"]https://arxiv.org/ftp/arxiv/papers/1203/1203.2701.pdf[/URL]</p><p></p><p>These academic guys measured primer blast waves. They used .308 Rem LRP brass & Lapua .308 SRP brass. Primer pockets were prepped to ensure uniform seating depths & uniform flash holes. They used a RCBS press to load primers into cases, most likely, the primer attachment that works when pulling up on press handle. </p><p></p><p>Results were shown:</p><p></p><p>[ATTACH=full]425866[/ATTACH]</p><p></p><p>As mentioned, wave forms had about same shapes, but blast peak pressure varied & same primer peak pressures varied with standard deviations from mean shown by Table 1. My thinking is - how will precision primer depth seating make for uniform peak pressures? </p><p></p><p>It was noted that more uniform velocities were obtained by using minimal primer peak blast pressures - like small primer in.308 & 6.5X47 Lapua match loads.</p><p></p><p> My thinking is that variations in peak pressures shown by differences in pressure measurements in kilo pascals would negate extra ordinary precision primer seating. Keeping in mind these academic guys proably never did bench rest or long-range precision shooting.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2708985, member: 115658"] I use a Lee press mounted priming tool. I have 2, large & small primer. I am satisfied with both, and seating depth is controlled. I seat primers so anvils touch, the Lee tool limits primer seating depth being adjusted for primer pocket depth. Of intertest: [URL unfurl="true"]https://arxiv.org/ftp/arxiv/papers/1203/1203.2701.pdf[/URL] These academic guys measured primer blast waves. They used .308 Rem LRP brass & Lapua .308 SRP brass. Primer pockets were prepped to ensure uniform seating depths & uniform flash holes. They used a RCBS press to load primers into cases, most likely, the primer attachment that works when pulling up on press handle. Results were shown: [ATTACH type="full"]425866[/ATTACH] As mentioned, wave forms had about same shapes, but blast peak pressure varied & same primer peak pressures varied with standard deviations from mean shown by Table 1. My thinking is - how will precision primer depth seating make for uniform peak pressures? It was noted that more uniform velocities were obtained by using minimal primer peak blast pressures - like small primer in.308 & 6.5X47 Lapua match loads. My thinking is that variations in peak pressures shown by differences in pressure measurements in kilo pascals would negate extra ordinary precision primer seating. Keeping in mind these academic guys proably never did bench rest or long-range precision shooting. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Looking for some feedback on primer seating tools
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