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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Pressure question
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<blockquote data-quote="royinidaho" data-source="post: 946194" data-attributes="member: 2011"><p>I've pretty much eliminated primer observations as pressure indicators.</p><p></p><p>I use only crummy Rem & Win brass. Though Win brass is better than Rem when available for the cartridge.</p><p></p><p>Pressure limits around my place are displayed by the case.</p><p></p><p>For max bullet performance and minimum barrel life pressures are kept only slightly below the point of a sticky bolt. I also try to get 6 firings from a case.</p><p></p><p>For reasonable bullet performance and zero probability of having to hammer open the bolt, which is usually due to inconsistent brass, I drop the charge a grain or two on the hottest day I figure to ever shoot. Then stick with that load. Cases last almost forever with these loads. However the magnums are not very extreme with this load.</p><p></p><p>Having said all of that every primer I remove from a fired case in the extreme magnums is flared to completely fill primer pocket. That is, the primer fills the slight bevel around the edge of the pocket.</p><p></p><p>I think cratering has something to do with firing pin size compared to the bolt's firing pin hole size, firing pen spring tension and shape.</p><p></p><p>I use Federal 215 mag primers. However all the above applies to the 270 Win with CCIs.</p><p></p><p>In your case I'd think that RL-33 may result in a bit higher peak pressure and reach that peak pressure sooner than Retumbo. Retumbo may have more area under the pressure curve which, for the most part, is a good thing. That is higher vel with less peak pressure.</p></blockquote><p></p>
[QUOTE="royinidaho, post: 946194, member: 2011"] I've pretty much eliminated primer observations as pressure indicators. I use only crummy Rem & Win brass. Though Win brass is better than Rem when available for the cartridge. Pressure limits around my place are displayed by the case. For max bullet performance and minimum barrel life pressures are kept only slightly below the point of a sticky bolt. I also try to get 6 firings from a case. For reasonable bullet performance and zero probability of having to hammer open the bolt, which is usually due to inconsistent brass, I drop the charge a grain or two on the hottest day I figure to ever shoot. Then stick with that load. Cases last almost forever with these loads. However the magnums are not very extreme with this load. Having said all of that every primer I remove from a fired case in the extreme magnums is flared to completely fill primer pocket. That is, the primer fills the slight bevel around the edge of the pocket. I think cratering has something to do with firing pin size compared to the bolt's firing pin hole size, firing pen spring tension and shape. I use Federal 215 mag primers. However all the above applies to the 270 Win with CCIs. In your case I'd think that RL-33 may result in a bit higher peak pressure and reach that peak pressure sooner than Retumbo. Retumbo may have more area under the pressure curve which, for the most part, is a good thing. That is higher vel with less peak pressure. [/QUOTE]
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