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Rifles, Reloading, Optics, Equipment
Reloading
Loading Range Brass and expecting Precision
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<blockquote data-quote="bigedp51" data-source="post: 1892360" data-attributes="member: 28965"><p>For my AR15s and bolt action .223 I just buy bulk once fired Lake City brass. And I also pickup any Lake City 5.56 brass I find at the range. And Lake City brass is above average in quality, uniformity and case weight variations and you won't cry if you loose a few cases like you would if it was Lapua brass. I full length resize using a non-bushing Forster die. A full length resized case does not have the case body or neck contacting the chamber walls. The bolt face supports the rear of the case and front of the case is supported by the bullet in the throat. The only part of the case that contacts the chamber is the case shoulder.</p><p></p><p>The resized case body should be .003 to .005 smaller in diameter than its fired diameter. This allows the case body to spring back from the chamber walls when fired and extract reliably.</p><p></p><p>[ATTACH=full]191364[/ATTACH]</p><p></p><p><strong>RULE ONE: Service Rifles Are Not Benchrest Rifles</strong></p><p>Gas-guns require a relatively loose fit between ammunition and chamber (vs. bolt actions) for safe, smooth operation. Many techniques, such as neck sizing and keeping cartridge headspace quite tight, are popular in the extreme bolt gun accuracy realm. However, they are of little value with Service Rifles, and some could even be hazardous. Before adopting a specialized technique, seriously consider whether it is appropriate and beneficial in a gas-gun.</p><p></p><p><span style="color: rgb(0, 0, 0)"><span style="font-size: 22px"><strong><a href="https://bulletin.accurateshooter.com/2019/10/save-by-using-lake-city-5-56x45mm-once-fired-gi-brass/" target="_blank">Save $$ By Using Lake City 5.56x45mm Once-Fired GI Brass</a></strong></span></span></p><p><span style="font-size: 15px"><a href="https://bulletin.accurateshooter.com/2019/10/save-by-using-lake-city-5-56x45mm-once-fired-gi-brass/" target="_blank">https://bulletin.accurateshooter.com/2019/10/save-by-using-lake-city-5-56x45mm-once-fired-gi-brass/</a></span></p><p></p><p><span style="font-size: 18px"><strong>Accuracy Potential of Mil-Surp 5.56×45 Brass</strong></span></p><p></p><p>So, how accurate can previously-fired GI surplus brass be in a good National Match AR-15? Well, here's a data point from many years ago that might be of interest. A High Power shooter who wrote for the late Precision Shooting magazine took a Bill Wylde-built AR match rifle to a registered Benchrest match. His first 5-round group ever fired in a BR match was officially measured at 0.231″ at 200 hundred yards. This was fired in front of witnesses, while using a moving target backer that confirmed all five rounds were fired.</p><p></p><p>He recounted that his <strong>ammo was loaded progressively</strong> with factory 52gr match bullets and a spherical powder using mixed years of LC brass with no special preparation whatsoever. Obviously, this was "exceptional". However, he had no difficulty obtaining consistent 0.5-0.6 MOA accuracy at 200 yards using LC brass and a generic "practice" load that was not tuned to his rifle.</p><p></p><p><img src="https://i.imgur.com/LjAQ7L9.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below you can see the extreme spread in case weight variations with Lake City brass being above average.</p><p></p><p><img src="https://i.imgur.com/PExmCCk.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><span style="font-size: 18px"></span></p><p><span style="font-size: 18px">How Hard is Your Brass? 5.56 and .223 Rem Base Hardness Tests</span></p><p><span style="font-size: 12px"><a href="http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/" target="_blank">http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/</a></span></p><p></p><p>[ATTACH=full]191367[/ATTACH]</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1892360, member: 28965"] For my AR15s and bolt action .223 I just buy bulk once fired Lake City brass. And I also pickup any Lake City 5.56 brass I find at the range. And Lake City brass is above average in quality, uniformity and case weight variations and you won't cry if you loose a few cases like you would if it was Lapua brass. I full length resize using a non-bushing Forster die. A full length resized case does not have the case body or neck contacting the chamber walls. The bolt face supports the rear of the case and front of the case is supported by the bullet in the throat. The only part of the case that contacts the chamber is the case shoulder. The resized case body should be .003 to .005 smaller in diameter than its fired diameter. This allows the case body to spring back from the chamber walls when fired and extract reliably. [ATTACH type="full" alt="1588331270657.png"]191364[/ATTACH] [B]RULE ONE: Service Rifles Are Not Benchrest Rifles[/B] Gas-guns require a relatively loose fit between ammunition and chamber (vs. bolt actions) for safe, smooth operation. Many techniques, such as neck sizing and keeping cartridge headspace quite tight, are popular in the extreme bolt gun accuracy realm. However, they are of little value with Service Rifles, and some could even be hazardous. Before adopting a specialized technique, seriously consider whether it is appropriate and beneficial in a gas-gun. [COLOR=rgb(0, 0, 0)][SIZE=6][B][URL='https://bulletin.accurateshooter.com/2019/10/save-by-using-lake-city-5-56x45mm-once-fired-gi-brass/']Save $$ By Using Lake City 5.56x45mm Once-Fired GI Brass[/URL][/B][/SIZE][/COLOR] [SIZE=4][URL]https://bulletin.accurateshooter.com/2019/10/save-by-using-lake-city-5-56x45mm-once-fired-gi-brass/[/URL][/SIZE] [SIZE=5][B]Accuracy Potential of Mil-Surp 5.56×45 Brass[/B][/SIZE] So, how accurate can previously-fired GI surplus brass be in a good National Match AR-15? Well, here’s a data point from many years ago that might be of interest. A High Power shooter who wrote for the late Precision Shooting magazine took a Bill Wylde-built AR match rifle to a registered Benchrest match. His first 5-round group ever fired in a BR match was officially measured at 0.231″ at 200 hundred yards. This was fired in front of witnesses, while using a moving target backer that confirmed all five rounds were fired. He recounted that his [B]ammo was loaded progressively[/B] with factory 52gr match bullets and a spherical powder using mixed years of LC brass with no special preparation whatsoever. Obviously, this was “exceptional”. However, he had no difficulty obtaining consistent 0.5-0.6 MOA accuracy at 200 yards using LC brass and a generic “practice” load that was not tuned to his rifle. [IMG]https://i.imgur.com/LjAQ7L9.jpg[/IMG] Below you can see the extreme spread in case weight variations with Lake City brass being above average. [IMG]https://i.imgur.com/PExmCCk.jpg[/IMG] [SIZE=5] How Hard is Your Brass? 5.56 and .223 Rem Base Hardness Tests[/SIZE] [SIZE=3][URL]http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/[/URL][/SIZE] [ATTACH type="full"]191367[/ATTACH] [/QUOTE]
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