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Rifles, Reloading, Optics, Equipment
Reloading
Large rifle primers
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<blockquote data-quote="MagnumManiac" data-source="post: 2779676" data-attributes="member: 10755"><p>I also run a Pressure Trace II, however I use raw data achieved to map what pressure I run.</p><p>According to my data, using a standard primer shows a gentle start pressure even with large amounts of powder. This makes the rise to max pressure more consistent and less violent. The same can be done using a magnum primer in a non-magnum cartridge, which I have done regularly to have have a higher start pressure to tune a load for more accuracy.</p><p>I have never believed that a magnum primer is necessary for powder amounts of 60gr or more.</p><p>Prior to magnum primers being made, many big bore cartridges used the same primers as small bore, so it simply isn't true that they are required for large amounts of powder.</p><p>In fact, a Berdan primer is far superior for start pressure consistency. The reasons are many and quite complex, but it has been proven to be far more accurate across the board than a Boxer primer system.</p><p>I agree with you regarding the use of hitter primers in sub zero temps, but they're not necessary in normal temps.</p><p>My Pressure Trace has always shown that Winchester primers were the hottest. Federal were very close, but their match primers were more consistent with start pressure. Another thing it showed was that CCI. match primers, both small and large, were no different to the equivalent standard marked primers and this is when I stopped using them.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2779676, member: 10755"] I also run a Pressure Trace II, however I use raw data achieved to map what pressure I run. According to my data, using a standard primer shows a gentle start pressure even with large amounts of powder. This makes the rise to max pressure more consistent and less violent. The same can be done using a magnum primer in a non-magnum cartridge, which I have done regularly to have have a higher start pressure to tune a load for more accuracy. I have never believed that a magnum primer is necessary for powder amounts of 60gr or more. Prior to magnum primers being made, many big bore cartridges used the same primers as small bore, so it simply isn’t true that they are required for large amounts of powder. In fact, a Berdan primer is far superior for start pressure consistency. The reasons are many and quite complex, but it has been proven to be far more accurate across the board than a Boxer primer system. I agree with you regarding the use of hitter primers in sub zero temps, but they’re not necessary in normal temps. My Pressure Trace has always shown that Winchester primers were the hottest. Federal were very close, but their match primers were more consistent with start pressure. Another thing it showed was that CCI. match primers, both small and large, were no different to the equivalent standard marked primers and this is when I stopped using them. Cheers. [/QUOTE]
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Large rifle primers
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