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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Full Length or Neck Only; What's Best Resizing for Accuracy?
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<blockquote data-quote="Bob Wright" data-source="post: 1804847" data-attributes="member: 104363"><p>I read a lot of engineering drawings over the years. This one is to an old drawing standard.</p><p>Here's my best take:</p><p>The caveat is in the notes, "all calculations are at MMC"</p><p>MMC is "maximum material condition", where all exterior diameters are their largest per the drawing and inside diameters are their smallest.</p><p>So, .002 diametral clearance is the least clearance that must be met by ammo manufacturers and brass aftermarket manufacturers.</p><p>The drawing does not specify the minimum material conditions of the brass. So, they must meet a cartridge case that simply doesnt come apart on firing at the pressures identified for that chambering. Some brass is engineered better than others...</p><p>It's my best guess on this drawing style, but I doubt .002 clearance on the diameter is the norm, but it did cause pressure "excursions" on my rifle and neck turning was the fix (.004).</p><p>Reloading dies are just another variable.</p></blockquote><p></p>
[QUOTE="Bob Wright, post: 1804847, member: 104363"] I read a lot of engineering drawings over the years. This one is to an old drawing standard. Here's my best take: The caveat is in the notes, "all calculations are at MMC" MMC is "maximum material condition", where all exterior diameters are their largest per the drawing and inside diameters are their smallest. So, .002 diametral clearance is the least clearance that must be met by ammo manufacturers and brass aftermarket manufacturers. The drawing does not specify the minimum material conditions of the brass. So, they must meet a cartridge case that simply doesnt come apart on firing at the pressures identified for that chambering. Some brass is engineered better than others... It's my best guess on this drawing style, but I doubt .002 clearance on the diameter is the norm, but it did cause pressure "excursions" on my rifle and neck turning was the fix (.004). Reloading dies are just another variable. [/QUOTE]
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Full Length or Neck Only; What's Best Resizing for Accuracy?
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