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Rifles, Reloading, Optics, Equipment
Reloading
What does "safe" mean?
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<blockquote data-quote="MudRunner2005" data-source="post: 1385896" data-attributes="member: 12995"><p>My custom A-Bolt II 7mmRM has a match-chamber with a tight SAAMI neck, so I don't have to neck-turn my cases, and my brass lasts nearly forever from barely any expansion and contraction, and only being neck-sized. I have noticed that the tri-lug design of the A-Bolt II masks bolt-lift pressure signs very well. For example, I can measure swelling of the belt with my calipers and notice when pressures are getting excessive. Thanks to the tight chamber specs, I've found my rifle's safe max is only 1.2 grains over Berger's book max with a 168 VLD, and the cases look great. However, velocities are blistering at over 3,100 FPS MV (measured on my MSv2) from a 26" barrel. Externally there's no excess pressure signs, but the primers have a much greater pancake lip. So, then I carefully decap the brass and measure the outer [flattened] edge of the primers with my calipers. I also measure belt swell. Average swell is .0006" to .0008", so if I hit .001", I know I need to back it down to a safe charge, which turned out to be right at 66 grains.</p><p></p><p>Now, disclaimer, while these measuring procedures were general practice for professionals back in the day before all the fancy tools and electronics, I am not saying they are very precise or consistent ways to measure pressure, unless you keep logs of this information, and you measure all of your brand new brass cases (especially between different lots), and log that info for future reference, before firing them. Also, your standard .001" calipers will not work, you will need calipers that measure to the .0001".</p><p></p><p>And for anyone who wants to get ****y and claim this is unsafe practice...Get mad at Hodgdon, not me. <a href="http://www.hodgdonreloading.com/reloading-education/tips-and-tricks/simple-trick-monitoring-pressure-your-rifle-reloads" target="_blank">http://www.hodgdonreloading.com/reloading-education/tips-and-tricks/simple-trick-monitoring-pressure-your-rifle-reloads</a> I read about this procedure years ago, and have been using it for years, and I just happened to find that Hodgdon has also listed it on their website, so it's obviously not too unsafe of a practice, or else they wouldn't be posting it for people to use.</p></blockquote><p></p>
[QUOTE="MudRunner2005, post: 1385896, member: 12995"] My custom A-Bolt II 7mmRM has a match-chamber with a tight SAAMI neck, so I don't have to neck-turn my cases, and my brass lasts nearly forever from barely any expansion and contraction, and only being neck-sized. I have noticed that the tri-lug design of the A-Bolt II masks bolt-lift pressure signs very well. For example, I can measure swelling of the belt with my calipers and notice when pressures are getting excessive. Thanks to the tight chamber specs, I've found my rifle's safe max is only 1.2 grains over Berger's book max with a 168 VLD, and the cases look great. However, velocities are blistering at over 3,100 FPS MV (measured on my MSv2) from a 26" barrel. Externally there's no excess pressure signs, but the primers have a much greater pancake lip. So, then I carefully decap the brass and measure the outer [flattened] edge of the primers with my calipers. I also measure belt swell. Average swell is .0006" to .0008", so if I hit .001", I know I need to back it down to a safe charge, which turned out to be right at 66 grains. Now, disclaimer, while these measuring procedures were general practice for professionals back in the day before all the fancy tools and electronics, I am not saying they are very precise or consistent ways to measure pressure, unless you keep logs of this information, and you measure all of your brand new brass cases (especially between different lots), and log that info for future reference, before firing them. Also, your standard .001" calipers will not work, you will need calipers that measure to the .0001". And for anyone who wants to get ****y and claim this is unsafe practice...Get mad at Hodgdon, not me. [URL]http://www.hodgdonreloading.com/reloading-education/tips-and-tricks/simple-trick-monitoring-pressure-your-rifle-reloads[/URL] I read about this procedure years ago, and have been using it for years, and I just happened to find that Hodgdon has also listed it on their website, so it's obviously not too unsafe of a practice, or else they wouldn't be posting it for people to use. [/QUOTE]
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What does "safe" mean?
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