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Rifles, Reloading, Optics, Equipment
Gunsmithing
headspace
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<blockquote data-quote="entoptics" data-source="post: 2312617" data-attributes="member: 104268"><p>FWIW, In my experience, new brass is nearly useless as a headspace measuring tool relative to SAAMI. In my experience, it's almost always at the absolute bottom of SAAMI specs, if not below.</p><p></p><p>0.008" growth on first firing wouldn't even make me blink. I had 0.031" growth on my 264 WM with Remington brass. That's on a Savage prefit, set with a Go-gauge, and confirmed No-Go with a piece of scotch tape on the Go-gauge (i.e. ≤ 0.003 above SAAMI minimum). ADG 7mm Rem Mag brass, was >0.010" growth, on my other Savage with headspace set the same.</p><p></p><p>My buddy's 30-06 (Factory pre-64 M70) had the tightest factory headspace I've ever seen, and new vs once fired was still ~0.010" with Remington brass.</p><p></p><p>Factory new brass (either component or loaded ammo) is SHORT usually. Presumably they want it to reliably feed in the shortest chamber imaginable. They're only responsible for that first shot, so have no concern about us reloaders who want to get a few shots on a piece brass before it comes unglued at the web...(well, except for the Peterson "Long" offerings <img class="smilie smilie--emoji" loading="lazy" alt="👏" title="Clapping hands :clap:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44f.png" data-shortname=":clap:" /> )</p></blockquote><p></p>
[QUOTE="entoptics, post: 2312617, member: 104268"] FWIW, In my experience, new brass is nearly useless as a headspace measuring tool relative to SAAMI. In my experience, it's almost always at the absolute bottom of SAAMI specs, if not below. 0.008" growth on first firing wouldn't even make me blink. I had 0.031" growth on my 264 WM with Remington brass. That's on a Savage prefit, set with a Go-gauge, and confirmed No-Go with a piece of scotch tape on the Go-gauge (i.e. ≤ 0.003 above SAAMI minimum). ADG 7mm Rem Mag brass, was >0.010" growth, on my other Savage with headspace set the same. My buddy's 30-06 (Factory pre-64 M70) had the tightest factory headspace I've ever seen, and new vs once fired was still ~0.010" with Remington brass. Factory new brass (either component or loaded ammo) is SHORT usually. Presumably they want it to reliably feed in the shortest chamber imaginable. They're only responsible for that first shot, so have no concern about us reloaders who want to get a few shots on a piece brass before it comes unglued at the web...(well, except for the Peterson "Long" offerings 👏 ) [/QUOTE]
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