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The Range
Ammo & Reloading
why is this ammo not accurate? Your accuracy tweaks.
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<blockquote data-quote="ASP785" data-source="post: 2644478" data-attributes="member: 12170"><p>My hypothesis is that charge weight and brass uniformity vary drastically form case to case. From experience with Remington component brass, its soft and not very uniform. If you shot that box over a chrono, I would guess you could see some where up to 150+ fps or so extreme spread. That's been about what I have measured with factory ammo. Whether that range was due to powder charge or neck tension, I couldn't answer that question.</p><p></p><p>Recently I ran some 308 loads through my DPMS and had some serious pressure issues caused by bullet setback / improper neck tension. For hunting, the Federal Premium line is probably going to be some of the best stuff you can buy from the factory.</p><p></p><p>I use Lapua brass on my accuracy loads and never use an expander ball. With a bushing die my necks are very consistent, so for me it goes:</p><p></p><p>1. Primer pocket uniformity</p><p>2. Charge weight, I can vary charge by about .2 grn + / - and not see it on the target or chronograph assuming all other dimensions of the brass are consistent.</p><p>3. bullet seating depth, which is rifle dependent</p></blockquote><p></p>
[QUOTE="ASP785, post: 2644478, member: 12170"] My hypothesis is that charge weight and brass uniformity vary drastically form case to case. From experience with Remington component brass, its soft and not very uniform. If you shot that box over a chrono, I would guess you could see some where up to 150+ fps or so extreme spread. That's been about what I have measured with factory ammo. Whether that range was due to powder charge or neck tension, I couldn't answer that question. Recently I ran some 308 loads through my DPMS and had some serious pressure issues caused by bullet setback / improper neck tension. For hunting, the Federal Premium line is probably going to be some of the best stuff you can buy from the factory. I use Lapua brass on my accuracy loads and never use an expander ball. With a bushing die my necks are very consistent, so for me it goes: 1. Primer pocket uniformity 2. Charge weight, I can vary charge by about .2 grn + / - and not see it on the target or chronograph assuming all other dimensions of the brass are consistent. 3. bullet seating depth, which is rifle dependent [/QUOTE]
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The Range
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why is this ammo not accurate? Your accuracy tweaks.
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