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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
224 Allen Magnum testing finished............
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<blockquote data-quote="Fiftydriver" data-source="post: 114463" data-attributes="member: 10"><p>Scott,</p><p></p><p>Just to clean up any confusion, the 277 Allen Mag is based on the 338 Lapua parent case, the 270 Allen Mag is based on the 7mm RUM.</p><p></p><p>I could have easily used the standar 7mm RUM case for the 257 and 6.5mm AMs but the design of these rounds was to allow them to fit in standard length receivers when throated very short with bullets in the 130 gr class weight to work in receivers such as Win M70s with standard length receivers.</p><p></p><p>That works very well, offering full length RUM capacity, in fact a bit more in a significantly shorter OAL round. When I designed the Allen Xpress rounds this sort of eliminated the need to short throat the AMs.</p><p></p><p>The reason I do not care for a shallow shoulder angle is becasue of brass stretching. These cases have alot of shoulder area, even with a shallow shoulder angle. Rem brass is not overly hard in the case head and brass flowing under high pressure can be a problem with a shallow shoulder angle. This was the main design reason for the shoulder angle I used.</p><p></p><p>Now that we have alot of slow burning ball powders this is not really a handicap. Beside, with a 25 cal with the capacity of the 257 AM, the slow ball powders are really the only good options to get high load density anyway so it works out well. Long case life, high performance.</p><p></p><p>I am not giving up on the 224 AM yet. Will have some reports on new testing soon.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 114463, member: 10"] Scott, Just to clean up any confusion, the 277 Allen Mag is based on the 338 Lapua parent case, the 270 Allen Mag is based on the 7mm RUM. I could have easily used the standar 7mm RUM case for the 257 and 6.5mm AMs but the design of these rounds was to allow them to fit in standard length receivers when throated very short with bullets in the 130 gr class weight to work in receivers such as Win M70s with standard length receivers. That works very well, offering full length RUM capacity, in fact a bit more in a significantly shorter OAL round. When I designed the Allen Xpress rounds this sort of eliminated the need to short throat the AMs. The reason I do not care for a shallow shoulder angle is becasue of brass stretching. These cases have alot of shoulder area, even with a shallow shoulder angle. Rem brass is not overly hard in the case head and brass flowing under high pressure can be a problem with a shallow shoulder angle. This was the main design reason for the shoulder angle I used. Now that we have alot of slow burning ball powders this is not really a handicap. Beside, with a 25 cal with the capacity of the 257 AM, the slow ball powders are really the only good options to get high load density anyway so it works out well. Long case life, high performance. I am not giving up on the 224 AM yet. Will have some reports on new testing soon. Good Shooting!! Kirby Allen(50) [/QUOTE]
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224 Allen Magnum testing finished............
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