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Tennessee Gun Owners Forums
Reloading
Small rifle magnum primers
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<blockquote data-quote="EastTNHunter" data-source="post: 5174464" data-attributes="member: 8364"><p>There is a reason that the Grendel calls for SRMPs with AA brass.</p><p></p><p>Bill Alexander designed the cartridge to use magnum primers (since they have a harder cup and help reduce the risk of slam fires, and to give a better ignition rate to the increased case capacity of the round originally designed for AR15s), so he insisted that AA headstamp brass use a smaller flash hole. AA brass has a smaller flash hole than other brands, and that's the reason that I don't use it. I truly don't like the logic applied to it, but I'm not an engineer either.</p><p></p><p> Starline and Hornady brass uses a larger (standard sized) flash hole and you could get by with standard SRPs for it (I do for some of my loads), but you still may get better performance out of the magnums, and the CCI41s and magnums will have less chance of a slam fire in an AR15 (I've never had one, and I don't shoot my rifle hot or dirty, so I'm not too terribly worried about it… but maybe I should be).</p><p></p><p>As with anything, if you change components then you should work back up. The Grendel can be particularly tricky with pressure on top end loads, so be very mindful of pressure signs.</p></blockquote><p></p>
[QUOTE="EastTNHunter, post: 5174464, member: 8364"] There is a reason that the Grendel calls for SRMPs with AA brass. Bill Alexander designed the cartridge to use magnum primers (since they have a harder cup and help reduce the risk of slam fires, and to give a better ignition rate to the increased case capacity of the round originally designed for AR15s), so he insisted that AA headstamp brass use a smaller flash hole. AA brass has a smaller flash hole than other brands, and that’s the reason that I don’t use it. I truly don’t like the logic applied to it, but I’m not an engineer either. Starline and Hornady brass uses a larger (standard sized) flash hole and you could get by with standard SRPs for it (I do for some of my loads), but you still may get better performance out of the magnums, and the CCI41s and magnums will have less chance of a slam fire in an AR15 (I’ve never had one, and I don’t shoot my rifle hot or dirty, so I’m not too terribly worried about it… but maybe I should be). As with anything, if you change components then you should work back up. The Grendel can be particularly tricky with pressure on top end loads, so be very mindful of pressure signs. [/QUOTE]
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Reloading
Small rifle magnum primers
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