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Rifles, Reloading, Optics, Equipment
Equipment Discussions
Allen Mags?
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<blockquote data-quote="brianwinzor" data-source="post: 86257" data-attributes="member: 1067"><p>Kirby, Thank you once again for lots of great information. </p><p></p><p>You mentioned that the capacity of the of the 257AX and 6.5AX would be about 10 - 12 grains less than the 257 AM (123 grains 8700), so I assume that the fireformed 6.5AX cases had a capacity of about 110 grains. </p><p></p><p>The 6.5 AX achieving 3500+ with the 120, and 3300+ with the 140 grain bullets is still impressive performance. </p><p></p><p>Regarding slower ball powders for the 257AM, have you investigated or tried to access NobelSport's Vectan SP13, which is a ball powder that is made for the 50BMG. I note that on several burning rate charts it is listed as the slowest burning powder available. A description of the powder is at this link: <a href="http://www.peterlawman.co.uk/vectan.php" target="_blank">http://www.peterlawman.co.uk/vectan.php</a></p><p></p><p>On the basis of your data, I estimate that a 7mm Dakota necked down to .257 would probably have about 100 - 103 grains capacity, and if Lapua goes ahead with manufacturing the Dakota cases, it would be the clincher in my decision to use the 7mm Dakota case for my project.</p><p></p><p>I look forward to hearing more progress reports on the development of the 6.5 (and 257 AX). Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 86257, member: 1067"] Kirby, Thank you once again for lots of great information. You mentioned that the capacity of the of the 257AX and 6.5AX would be about 10 - 12 grains less than the 257 AM (123 grains 8700), so I assume that the fireformed 6.5AX cases had a capacity of about 110 grains. The 6.5 AX achieving 3500+ with the 120, and 3300+ with the 140 grain bullets is still impressive performance. Regarding slower ball powders for the 257AM, have you investigated or tried to access NobelSport's Vectan SP13, which is a ball powder that is made for the 50BMG. I note that on several burning rate charts it is listed as the slowest burning powder available. A description of the powder is at this link: [url="http://www.peterlawman.co.uk/vectan.php"]http://www.peterlawman.co.uk/vectan.php[/url] On the basis of your data, I estimate that a 7mm Dakota necked down to .257 would probably have about 100 - 103 grains capacity, and if Lapua goes ahead with manufacturing the Dakota cases, it would be the clincher in my decision to use the 7mm Dakota case for my project. I look forward to hearing more progress reports on the development of the 6.5 (and 257 AX). Brian. [/QUOTE]
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Allen Mags?
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