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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Allen Mag test rifle finished.....
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<blockquote data-quote="Fiftydriver" data-source="post: 75170" data-attributes="member: 10"><p>Derek M.</p><p></p><p>As you see the rounds in the pics above, the usible powder capacity for each of the big rounds is as follows: This is using WC872. This is not the top load they can be loaded with, just the top volume converted to powder weight in grains.</p><p></p><p>7mm RUM...........104.0 gr</p><p>257 Allen Mag.....105.0 gr</p><p>270 Allen Mag.....111.0 gr </p><p>7mm Allen Mag.....118.0 gr</p><p></p><p>Now, with the throating reamer I have coming in, I will be able to seat the 7mm Allen Mag out to the max 3.650-3.700" allowed in the Rem 700 and this would bring max usible case capacity to the 121-122 gr area compared to 104 for the 7mm RUM.</p><p></p><p>These figures are all figured using the 160 gr Accubond in the 7mm AM and RUM, the 156 gr ULD RBBT in the 257 AM and the 169.5 gr ULD in the 270 AM.</p><p></p><p>Not only will the added case capacity help, just as important, the stronger case design will allow the loads to handle higher pressures with the WC872 powder which will result in a more consistant, cleaner burning result which is also a benefit.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 75170, member: 10"] Derek M. As you see the rounds in the pics above, the usible powder capacity for each of the big rounds is as follows: This is using WC872. This is not the top load they can be loaded with, just the top volume converted to powder weight in grains. 7mm RUM...........104.0 gr 257 Allen Mag.....105.0 gr 270 Allen Mag.....111.0 gr 7mm Allen Mag.....118.0 gr Now, with the throating reamer I have coming in, I will be able to seat the 7mm Allen Mag out to the max 3.650-3.700" allowed in the Rem 700 and this would bring max usible case capacity to the 121-122 gr area compared to 104 for the 7mm RUM. These figures are all figured using the 160 gr Accubond in the 7mm AM and RUM, the 156 gr ULD RBBT in the 257 AM and the 169.5 gr ULD in the 270 AM. Not only will the added case capacity help, just as important, the stronger case design will allow the loads to handle higher pressures with the WC872 powder which will result in a more consistant, cleaner burning result which is also a benefit. Good Shooting!! Kirby Allen(50) [/QUOTE]
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7mm Allen Mag test rifle finished.....
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