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Norma Brass QA/QCDiscussions related to Guns and Firearms
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minerfile Member
Joined: May 09, 2005 Posts: 51 Location: St. Johns, AZ
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Posted: Mon Sep 08, 2014 3:15 pm Post subject: Norma Brass QA/QC |
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In the quest for accuracy in my 22-250 bench rest rifle I decided to try some premium brass, I looked at Nosler, Lapua and Norma, since only the Norma was in stock at the time that's what I went with. They arrived in 10 boxes of 25 each, individually partitioned, nice touch. Upon inspection all of the case lengths were spot on and I could only find one case mouth that was out of round. I decided to weight sort them, here's what I found.
151.0-151.9g 1 case
152.0-152.9g 17 cases
153.0-153.9g 150 cases
154.0-154.9g 80 cases
155.0-155.9g 2 cases
I spot checked my Remington cases and they were all over the place from 151 to 158 grains each.
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slimjim Super Member
Joined: May 16, 2009 Posts: 8314 Location: Fort Worth TX
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Posted: Mon Sep 08, 2014 4:44 pm Post subject: Re: Norma Brass QA/QC |
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Case weight is one measure of quality. I also measure neck thickness uniformity. High quality brass will have a variation of 0.001". I have some new brass that is 0.004" or more. As the case goes through its firing cycles, the thicker parts don't stretch as much as the thinner portions and the uniformity only gets worse.
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Vince Site Admin
Joined: May 25, 2005 Posts: 15704 Location: Brisbane AUSTRALIA
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