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The Range
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CBI pistol powder data
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<blockquote data-quote="Dumpstick" data-source="post: 3843742" data-attributes="member: 41653"><p>Re-shot the 6.4gr (1.09cc AutoDisc) load, using CCI SP Magnum primers. This was the load with the NOE 175 (182 as cast) bullet.</p><p></p><p>Reg primer - 973 MV, 118 ES, 41.6 SD</p><p>Mag primer - 987 MV, 114 ES, 34.7 SD</p><p></p><p>Some difference, sure. But, enough to make a difference ? I don't know. And, it's a 12 shot test. Not really enough to clear the fog of a small batch.</p><p></p><p>I also shot another load, which I edited in on post #2, just to keep it all in one place.</p><p></p><p>6.8gr (Lee 1.18cc AutoDisc) 1025 fps, 90 ES, 25.5 SD</p><p></p><p>Notes on the 6.8gr load - </p><p>- First, I'm considering it max. I started to get sticky extraction. After the first bump of the extractor the cases fell out, but still. I looked at the primers and cannot see any flattening, but I'm using CCI primers, which are known for being harder than most. Someone else may take it another step, I'm not.</p><p></p><p>- Second, the accuracy was noticeably better with the 6.8gr load. However, I used gas check bullets on this load. Was it the powder charge that caused the accuracy difference, or the gas check? I don't know. The internal ballistics support the heavier powder charge being at least part of the answer.</p><p></p><p>- Third. If I run the numbers on just the last cylinder (6 rounds) fired of the 6.8gr load this is what I get:</p><p> 1036 fps, 21 ES, 7.1 SD</p><p>Quite a difference from the aggregate. What happened there? I have no idea. Loaded in sequence with the rest of the rounds.</p></blockquote><p></p>
[QUOTE="Dumpstick, post: 3843742, member: 41653"] Re-shot the 6.4gr (1.09cc AutoDisc) load, using CCI SP Magnum primers. This was the load with the NOE 175 (182 as cast) bullet. Reg primer - 973 MV, 118 ES, 41.6 SD Mag primer - 987 MV, 114 ES, 34.7 SD Some difference, sure. But, enough to make a difference ? I don't know. And, it's a 12 shot test. Not really enough to clear the fog of a small batch. I also shot another load, which I edited in on post #2, just to keep it all in one place. 6.8gr (Lee 1.18cc AutoDisc) 1025 fps, 90 ES, 25.5 SD Notes on the 6.8gr load - - First, I'm considering it max. I started to get sticky extraction. After the first bump of the extractor the cases fell out, but still. I looked at the primers and cannot see any flattening, but I'm using CCI primers, which are known for being harder than most. Someone else may take it another step, I'm not. - Second, the accuracy was noticeably better with the 6.8gr load. However, I used gas check bullets on this load. Was it the powder charge that caused the accuracy difference, or the gas check? I don't know. The internal ballistics support the heavier powder charge being at least part of the answer. - Third. If I run the numbers on just the last cylinder (6 rounds) fired of the 6.8gr load this is what I get: 1036 fps, 21 ES, 7.1 SD Quite a difference from the aggregate. What happened there? I have no idea. Loaded in sequence with the rest of the rounds. [/QUOTE]
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