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Rifles, Reloading, Optics, Equipment
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Allen Mags?
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<blockquote data-quote="Fiftydriver" data-source="post: 86311" data-attributes="member: 10"><p>Brian,</p><p></p><p>I must have reported the case capacities of the Allen Mags wrong as the 257 and 6.5mm Allen Magnums have basically the same case capacity of the standard 7mm RUM case which is around 116 vs. 116 gr of WC872.</p><p></p><p>The 270 Allen Mag DOES have a case capacity of 123 gr on average which is where I may have misprinted the capacity information.</p><p></p><p>This is how the case capacities come out for an average of five cases of each round, all filled to the mouth with 872:</p><p></p><p>6.5mm AX.........104 gr</p><p>257 AM...........116 gr</p><p>7mm RUM..........117 gr</p><p>270 AM...........123 gr</p><p>7mm AM...........127 gr</p><p></p><p>As far as the case capacity of the 7mm and 300 Dakota parent cases. The 7mm holds 93.0 gr filled to the mouth with WC872 and the 300 holds 99.0 gr filled to the mouth.</p><p></p><p>The 7mm has a longer neck but the 300 has a larger diameter neck so I sould predict the neck volume on each is very similiar. Basically they are within 6 grains capacity of each other. If you improved the 7mm Dakota case I would say you would be in the 98-100 gr range for total case capacity, basically what you predicted.</p><p></p><p>I will have to do some reseach into SP13. May be very usefull!! Thanks for the ling.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 86311, member: 10"] Brian, I must have reported the case capacities of the Allen Mags wrong as the 257 and 6.5mm Allen Magnums have basically the same case capacity of the standard 7mm RUM case which is around 116 vs. 116 gr of WC872. The 270 Allen Mag DOES have a case capacity of 123 gr on average which is where I may have misprinted the capacity information. This is how the case capacities come out for an average of five cases of each round, all filled to the mouth with 872: 6.5mm AX.........104 gr 257 AM...........116 gr 7mm RUM..........117 gr 270 AM...........123 gr 7mm AM...........127 gr As far as the case capacity of the 7mm and 300 Dakota parent cases. The 7mm holds 93.0 gr filled to the mouth with WC872 and the 300 holds 99.0 gr filled to the mouth. The 7mm has a longer neck but the 300 has a larger diameter neck so I sould predict the neck volume on each is very similiar. Basically they are within 6 grains capacity of each other. If you improved the 7mm Dakota case I would say you would be in the 98-100 gr range for total case capacity, basically what you predicted. I will have to do some reseach into SP13. May be very usefull!! Thanks for the ling. Kirby Allen(50) [/QUOTE]
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Allen Mags?
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