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The Water Cooler
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NOT A Good Feeling
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<blockquote data-quote="criticalbass" data-source="post: 1903997" data-attributes="member: 711"><p>This really bites. Good that you did some research before firing this stuff. If you know a highly experienced reloader you might pull a statistically valid sample at random from the lot and see if the powder is identifiable. If it is, weigh the powder charges from the sample, weigh the bullets, and look at published loads to see if they fall into the pressure range appropriate to the Garand.</p><p></p><p>I still remember how surprised I was at the Garand's requirements. Would have assumed that it would eat everything, but not so.</p><p></p><p>Problem is, if you only have 100 rounds and want to be 95% confident of your sample, plus or minus 5, you have to sample 80 of the 100 rounds. For 1000 at the same level of confidence and the same confidence interval, the number is 278.</p><p></p><p><a href="http://www.surveysystem.com/sscalc.htm" target="_blank">http://www.surveysystem.com/sscalc.htm</a> This is a link to a sample size generator. Of course selecting a random sample isn't as simple as it appears.</p><p></p><p>Did you know that 81.3% of all statistics are made up on the spot?<img src="/images/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p><p></p><p>I strongly recommend you sell it to some brave bolt gun guy, but I bought some Silver Bear stuff several years ago in 30-06 that was so high pressure it jammed a Ruger 77-Mark II so badly it took a rubber hammer to open the bolt. Primer flowed, and printing on the case head was almost squeezed out of existence. Gunsmith checked it and declared it okay, but I never used any more Silver Bear.</p></blockquote><p></p>
[QUOTE="criticalbass, post: 1903997, member: 711"] This really bites. Good that you did some research before firing this stuff. If you know a highly experienced reloader you might pull a statistically valid sample at random from the lot and see if the powder is identifiable. If it is, weigh the powder charges from the sample, weigh the bullets, and look at published loads to see if they fall into the pressure range appropriate to the Garand. I still remember how surprised I was at the Garand's requirements. Would have assumed that it would eat everything, but not so. Problem is, if you only have 100 rounds and want to be 95% confident of your sample, plus or minus 5, you have to sample 80 of the 100 rounds. For 1000 at the same level of confidence and the same confidence interval, the number is 278. [url]http://www.surveysystem.com/sscalc.htm[/url] This is a link to a sample size generator. Of course selecting a random sample isn't as simple as it appears. Did you know that 81.3% of all statistics are made up on the spot?:) I strongly recommend you sell it to some brave bolt gun guy, but I bought some Silver Bear stuff several years ago in 30-06 that was so high pressure it jammed a Ruger 77-Mark II so badly it took a rubber hammer to open the bolt. Primer flowed, and printing on the case head was almost squeezed out of existence. Gunsmith checked it and declared it okay, but I never used any more Silver Bear. [/QUOTE]
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