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March 5, 2012, 11:41 PM | #1 |
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.223 Varget & Magnum primers?
How much should I back off the powder when using CCI 450 primers in an AR? My Hornady manual lists 23.5 grs a max load with a 75HPBT.
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March 6, 2012, 12:12 AM | #2 |
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I came to understand that BR primers were the hottest in primers, If you have experience reloading the only safe way is to start at the min and work your way up while checking for signs of pressure and accuracy.
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March 6, 2012, 04:56 AM | #3 |
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Yeah, you want to back off from max at least 10% and work the load up with the different components looking for pressure signs along the way. So in this instance I'd back up to 21 grains and do a ladder workup in .2 grain increments. FWIW, when I do workups I usually end up finding a sweet spot before I reach max anyway.
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March 6, 2012, 09:57 PM | #4 | |
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March 6, 2012, 11:02 PM | #5 |
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You don't want to back off from Max at all. You need to Start your load development at the "Start" charge and work up checking for signs of high pressure. Just backing off from a published max is a guess at best and a bad idea. A Chrony ism't a bad idea either.
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March 6, 2012, 11:16 PM | #6 | |
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March 6, 2012, 11:23 PM | #7 |
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In the old days they didn't publish a minimum, you had to do a little math and back off from max to start.
Any small rifle primer will work safely. Some may be more accurate than others for you, or you may not notice. |
March 6, 2012, 11:50 PM | #8 | |
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March 7, 2012, 08:42 AM | #9 | |
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March 7, 2012, 05:05 PM | #10 | |
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March 7, 2012, 09:26 PM | #11 |
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Mag primers in a 26gr case with Varget? I don't get it. Mag primers give significant added pressure with the attendant bolt thrust in an auto. At 40 a thousand, why risk it?
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March 7, 2012, 09:32 PM | #12 |
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I load for a bolt action, and have had good luck using standard CCI small rifle primers. I have used Winchester Primers with the same loads, and the results were too close to tell a dirreance.
Then again I am not shooting an AR, nor do I (or likely will) shoot in exteem weather. If it is under 45 outside I am staying it. Here in this part of Texas it will usualy warm up in a day or two. If it is hotter than 95 in the shade I will either shoot early in the morning, or in the evening after it has cooled down. I have other hobbies that can be doen inside. I would say when in doubt. Go load up a few from starting load up to the load you were using. If you see pressure signs before reaching the load you were using, or accuracy falls off go with the one that gave the best accuracy.
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March 8, 2012, 10:25 AM | #13 | |
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