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Rifles, Reloading, Optics, Equipment
Gunsmithing
300 RUM saami min headspace to datum line?
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<blockquote data-quote="J E Custom" data-source="post: 638699" data-attributes="member: 2736"><p>SAMMI chamber spec is 2.478</p><p></p><p>SAMMI loaded ammo is 2.474 min.</p><p></p><p>It does sound like you may have a tight chamber(Measuring can be difficult and is not always</p><p>exact so it is best to measure a fired case and with the same setup measure a sized case for </p><p>the difference.</p><p></p><p>Reamers are normally very precise but after one is used very much they may make a small/</p><p>tight chamber. this is still OK but you have to make adjustments with the dies.</p><p></p><p>The only other possibility that I Can thing of that would cause this is excessive pressure, so look </p><p>at bullet seating depth or back off on your powder charge just a little because of the smaller</p><p>chamber.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 638699, member: 2736"] SAMMI chamber spec is 2.478 SAMMI loaded ammo is 2.474 min. It does sound like you may have a tight chamber(Measuring can be difficult and is not always exact so it is best to measure a fired case and with the same setup measure a sized case for the difference. Reamers are normally very precise but after one is used very much they may make a small/ tight chamber. this is still OK but you have to make adjustments with the dies. The only other possibility that I Can thing of that would cause this is excessive pressure, so look at bullet seating depth or back off on your powder charge just a little because of the smaller chamber. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
300 RUM saami min headspace to datum line?
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