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Rifles, Reloading, Optics, Equipment
Reloading
Nosler Custom Brass ?
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<blockquote data-quote="SakoShooterSD" data-source="post: 516298" data-attributes="member: 33931"><p>I just measured 100 pieces of new Norma 7mm Rem Mag cases (bought last week because I couldn't find any Nosler available) and here is what I got: </p><p> </p><p><span style="font-family: 'Calibri'">avg= </span><span style="font-family: 'Calibri'">215.07</span></p><p><span style="font-family: 'Calibri'">max=</span><span style="font-family: 'Calibri'">215.96</span></p><p><span style="font-family: 'Calibri'">min=</span><span style="font-family: 'Calibri'">214.24</span></p><p><span style="font-family: 'Calibri'">range=</span><span style="font-family: 'Calibri'">1.72</span></p><p><span style="font-family: 'Calibri'">stdev=</span><span style="font-family: 'Calibri'">0.382</span> </p><p> </p><p>(Measurements made on Sartorius AY/VIC-123, and spot checked with RCBS 5-0-5.)</p><p> </p><p>These cases have no primers in them yet, so . . . </p><p>What's a spent primer weigh? About 5gr. </p><p> </p><p>I just measured 5 or 6 pieces of my thrice fired Nosler brass, and they all came in around 233 gr, without primers, and about . . . I just measured three more at 238 gr with spent primers.</p><p> </p><p>So, that would put your Norma cases at approximately 210 gr without primers, and mine around 215 gr. </p><p>I guess that's pretty close for lot-to-lot matching. </p><p> </p><p>I have heard the Nosler is weight sorted to tight groups (I've heard everything from 0.4 gr spread up to 0.9 gr spread. Not sure what to believe. I haven't seen any data on large sample size, and haven't measured many myself -- just the handful just now.)</p><p> </p><p>I was a little concerned at the 1.7 gr spread in the Norma. </p><p>Is that big enough that I should be sorting these cases?</p><p>What is an acceptable range in weights for "BR accuracy"?</p><p> </p><p>How well does brass weight correlate with case capacity . . . or, more importantly, required powder charge (consistent chamber pressure/muzzle velocity) ? </p><p> </p><p>Anybody want to offer up a guess, or a good rule of thumb here?</p></blockquote><p></p>
[QUOTE="SakoShooterSD, post: 516298, member: 33931"] I just measured 100 pieces of new Norma 7mm Rem Mag cases (bought last week because I couldn't find any Nosler available) and here is what I got: [FONT=Calibri]avg= [/FONT][FONT=Calibri]215.07[/FONT] [FONT=Calibri]max=[/FONT][FONT=Calibri]215.96[/FONT] [FONT=Calibri]min=[/FONT][FONT=Calibri]214.24[/FONT] [FONT=Calibri]range=[/FONT][FONT=Calibri]1.72[/FONT] [FONT=Calibri]stdev=[/FONT][FONT=Calibri]0.382[/FONT] (Measurements made on Sartorius AY/VIC-123, and spot checked with RCBS 5-0-5.) These cases have no primers in them yet, so . . . What's a spent primer weigh? About 5gr. I just measured 5 or 6 pieces of my thrice fired Nosler brass, and they all came in around 233 gr, without primers, and about . . . I just measured three more at 238 gr with spent primers. So, that would put your Norma cases at approximately 210 gr without primers, and mine around 215 gr. I guess that's pretty close for lot-to-lot matching. I have heard the Nosler is weight sorted to tight groups (I've heard everything from 0.4 gr spread up to 0.9 gr spread. Not sure what to believe. I haven't seen any data on large sample size, and haven't measured many myself -- just the handful just now.) I was a little concerned at the 1.7 gr spread in the Norma. Is that big enough that I should be sorting these cases? What is an acceptable range in weights for "BR accuracy"? How well does brass weight correlate with case capacity . . . or, more importantly, required powder charge (consistent chamber pressure/muzzle velocity) ? Anybody want to offer up a guess, or a good rule of thumb here? [/QUOTE]
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