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Rifles, Reloading, Optics, Equipment
Gunsmithing
acceptable headspace growth for a 7stw???
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<blockquote data-quote="J E Custom" data-source="post: 972519" data-attributes="member: 2736"><p>It is a different chamber and reamer that is the difference.</p><p></p><p>Head space is usually from .0005 to .003. </p><p></p><p>Two belted chambers with the same head space can produce two different length cases because they head space on the belt.</p><p></p><p>Once you fire form they should not change any more unless you have the dies set incorrectly</p><p>or you are over loading the case/cartridge.</p><p></p><p>The SAMME dimensions for a 7mm STW case length are 2.830 to 2.850.</p><p></p><p>So once you fire form the brass in you new chamber it should not change (You will have to reset your dies).</p><p></p><p>So if the chamber is .020 longer it is still within SAMME specs.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 972519, member: 2736"] It is a different chamber and reamer that is the difference. Head space is usually from .0005 to .003. Two belted chambers with the same head space can produce two different length cases because they head space on the belt. Once you fire form they should not change any more unless you have the dies set incorrectly or you are over loading the case/cartridge. The SAMME dimensions for a 7mm STW case length are 2.830 to 2.850. So once you fire form the brass in you new chamber it should not change (You will have to reset your dies). So if the chamber is .020 longer it is still within SAMME specs. J E CUSTOM [/QUOTE]
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acceptable headspace growth for a 7stw???
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