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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Forming 375 Ruger brass from 8x68s cases
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<blockquote data-quote="Pdvdh" data-source="post: 1500832" data-attributes="member: 4191"><p>Evidently <strong>Norma 8x68S</strong> brass is being sold on the retail market in different grades when it comes to dimensional tolerances. Which was somewhat surprising for me. I didn't know Norma was marketing unprimed casings in different quality control batches. <u>Here's what I determined as well as how I determined it</u>:</p><p></p><p>I purchased 20 Norma cases from Huntington Die Specialties around 4 months ago. They came in a 20Ct plain-Jane white cardboard container without any separation within the box. All cases were in direct contact with one another.</p><p></p><p>I purchased 50 casings from Midway USA about 1 1/2 months ago. They came in 25Ct fancy <strong>norma</strong> <span style="font-family: 'Book Antiqua'"><strong><em>USA</em></strong> </span>cardboard boxes, each case separated by individual cardboard slots and covered with a piece of foam to keep them from rattling and banging against one another during storage and shipment.</p><p></p><p>The Hungtington cases looked a bit rough to me. Additionally one of the 20 casings came with an oversized primer pocket which was so large that one could see the flaw with the naked eye. It was about 0.015" over-sized, which meant a primer would rattle around loose in the primer pocket. A defective primer pocket straight from the Norma factory. Huntington replaced that case sight unseen, so good on them.</p><p></p><p>The Midway USA cases looked highly uniform and polished in comparison. So I set about weighing all of the cases, both from Huntington's and Midway USA. I also measured the cases for pertinent dimensional tolerances. The Midway USA cases are clearly the premier casings, based on both weight and measurement tolerances.</p><p></p><p>For those with the interest, following is a tabular chart I created to illustrate the differences between the two sources of Norma 8x68S casings. Even though I weighed 50 Midway USA sourced cases, compared to 20 Huntington sourced cases, the Midway USA cases still had an extreme spread in case weights which was 60% less than the Huntington cases. Also note the difference in the outer diameter dimensions of the extractor grooves and rims. The OD of the case webs just forward of the case rims was exceptionally consistent on the 50 Midway USA cases. I <u>measured a sampling of 20 case web diameter</u>s and all measured right at 0.5180" diameter, except one case, which measured 0.5175", on my Mitutoyo digital calipers, which read out down to 0.0005". The Huntington brass varied in the case web diameter dimension so much that I simply averaged them when I collected those measurements several months ago.</p><p></p><p>Never set out on a mission to critique the quality of the Norma cases from the two different sources, but it is what it is. And if we don't share these findings on a Forum such as this one, then we all end up less knowledgeable than necessary. No apologies here to either of my two sources of Norma 8x68S casings.</p><p></p><p>[ATTACH=full]108973[/ATTACH]</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1500832, member: 4191"] Evidently [B]Norma 8x68S[/B] brass is being sold on the retail market in different grades when it comes to dimensional tolerances. Which was somewhat surprising for me. I didn't know Norma was marketing unprimed casings in different quality control batches. [U]Here's what I determined as well as how I determined it[/U]: I purchased 20 Norma cases from Huntington Die Specialties around 4 months ago. They came in a 20Ct plain-Jane white cardboard container without any separation within the box. All cases were in direct contact with one another. I purchased 50 casings from Midway USA about 1 1/2 months ago. They came in 25Ct fancy [B]norma[/B] [FONT=Book Antiqua][B][I]USA[/I][/B] [/FONT]cardboard boxes, each case separated by individual cardboard slots and covered with a piece of foam to keep them from rattling and banging against one another during storage and shipment. The Hungtington cases looked a bit rough to me. Additionally one of the 20 casings came with an oversized primer pocket which was so large that one could see the flaw with the naked eye. It was about 0.015" over-sized, which meant a primer would rattle around loose in the primer pocket. A defective primer pocket straight from the Norma factory. Huntington replaced that case sight unseen, so good on them. The Midway USA cases looked highly uniform and polished in comparison. So I set about weighing all of the cases, both from Huntington's and Midway USA. I also measured the cases for pertinent dimensional tolerances. The Midway USA cases are clearly the premier casings, based on both weight and measurement tolerances. For those with the interest, following is a tabular chart I created to illustrate the differences between the two sources of Norma 8x68S casings. Even though I weighed 50 Midway USA sourced cases, compared to 20 Huntington sourced cases, the Midway USA cases still had an extreme spread in case weights which was 60% less than the Huntington cases. Also note the difference in the outer diameter dimensions of the extractor grooves and rims. The OD of the case webs just forward of the case rims was exceptionally consistent on the 50 Midway USA cases. I [U]measured a sampling of 20 case web diameter[/U]s and all measured right at 0.5180" diameter, except one case, which measured 0.5175", on my Mitutoyo digital calipers, which read out down to 0.0005". The Huntington brass varied in the case web diameter dimension so much that I simply averaged them when I collected those measurements several months ago. Never set out on a mission to critique the quality of the Norma cases from the two different sources, but it is what it is. And if we don't share these findings on a Forum such as this one, then we all end up less knowledgeable than necessary. No apologies here to either of my two sources of Norma 8x68S casings. [ATTACH=full]108973[/ATTACH] [/QUOTE]
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Forming 375 Ruger brass from 8x68s cases
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