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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Buying 308 ammo with intention of reloading
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<blockquote data-quote="Bart B" data-source="post: 500854" data-attributes="member: 5302"><p>Federal brass has been exceptionally good. So it's a bit softer than others. I reloaded one Federal brass .308 Win. case 47 times full length sizing it and using max loads. Never annealed the neck. Muzzle velocity spread was about 30 fps with metered IMR4895.</p><p></p><p>It doesn't matter how one sizes a .308 Win. case neck, or any other rimless bottleneck case for that matter. The round's perfectly centered in the front of the chamber by its shoulder mating perfectly with the chamber shoulder when the firing pin drives the case forward hard into the shoulder. Neck diameter of chamber and case don't matter; the neck floats someplace in the chamber neck. And full length sizing further ensures the case neck will be centered on the case shoulder as the case body's held in line with the neck when it's full length sized. Plus, as there's no such thing as a perfectly round case or chamber, full length sizing ensures there'll be enough clearance between case and chamber body to prevent interference. </p><p></p><p>This may be why Sierra full length sizes all their cases (Redding full bushing or standard dies nowadays) used to test their bullets for accuracy; does anybody get better accuracy with Sierra's than they do? And the smallest 10-shot plus test groups with .308 Win. ammo I know of have all been done with full length sized cases in standard SAAMI chambers. Same for belted cases as far as I know.</p><p></p><p>I'd stay away from once fired Lake City cases if good accuracy is your objective. They've all been fired in rifles with bolt faces not squared. Their heads are quite a bit out of square and don't get squared up by resizing them. Top military teams tried resizing their 30 caliber match cases but they never shot as accurate as new ones.</p></blockquote><p></p>
[QUOTE="Bart B, post: 500854, member: 5302"] Federal brass has been exceptionally good. So it's a bit softer than others. I reloaded one Federal brass .308 Win. case 47 times full length sizing it and using max loads. Never annealed the neck. Muzzle velocity spread was about 30 fps with metered IMR4895. It doesn't matter how one sizes a .308 Win. case neck, or any other rimless bottleneck case for that matter. The round's perfectly centered in the front of the chamber by its shoulder mating perfectly with the chamber shoulder when the firing pin drives the case forward hard into the shoulder. Neck diameter of chamber and case don't matter; the neck floats someplace in the chamber neck. And full length sizing further ensures the case neck will be centered on the case shoulder as the case body's held in line with the neck when it's full length sized. Plus, as there's no such thing as a perfectly round case or chamber, full length sizing ensures there'll be enough clearance between case and chamber body to prevent interference. This may be why Sierra full length sizes all their cases (Redding full bushing or standard dies nowadays) used to test their bullets for accuracy; does anybody get better accuracy with Sierra's than they do? And the smallest 10-shot plus test groups with .308 Win. ammo I know of have all been done with full length sized cases in standard SAAMI chambers. Same for belted cases as far as I know. I'd stay away from once fired Lake City cases if good accuracy is your objective. They've all been fired in rifles with bolt faces not squared. Their heads are quite a bit out of square and don't get squared up by resizing them. Top military teams tried resizing their 30 caliber match cases but they never shot as accurate as new ones. [/QUOTE]
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Buying 308 ammo with intention of reloading
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