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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: 114242" data-attributes="member: 10"><p>Brian,</p><p></p><p>I see what you are saying.</p><p></p><p>If I may offer some food for thought about your new wildcat design. First off I think its a hell of an idea, basically the exact same thing as my 257 Allen Xpress based on the 300 Dakota case which is 2.550" long. Everything else is the same with the Xpress as it is with the Allen Mag, just a shorter case body.</p><p></p><p>I will be building a light weight rifle in 257 Allen Xpress here soon for a hunting rifle and will be testing the 142 and 156 gr ULD RBBTs in this rifle. I have already tested the 6.5mm Allen Xpress which is the same thing as the 257 Xpress just necked up to 6.5mm. In a 26" barrel it will easily drive a 142 class bullet to 3300 fps so I suspect you will definately get to the 3150 fps level.</p><p></p><p>As to my advice, because you are limited with the powders you can use, you may want to consider using a shoulder angle in the 25 to 28 degree range. 25 degrees is the same as the STW rounds. The reason I say this is because if you go to a steeper shoulder or even retain the 30 degree angle of the RUM case, you more then likely will run into powder bridging issues with any slow burning stick powder.</p><p></p><p>I can not use any stick powders in my 257 Allen Mag for this reason. I can only use Ramshot Magnum, AA8700, H-870, US869 or WC872.</p><p></p><p>H-50BMG is a very large kernal powder as is 20N29. I suspect you may have problems with these powders and powder bridging, the best change you would have to avoid this is a shallower shoulder angle.</p><p></p><p>I know, not sexy or modern looking really but it may be vastly more functional. I still do not think H-50BMG and 20N29 would work but you could use powders such as Retumbo, RL-25 or similiar burn rate powders as these both perform very well in the STW.</p><p></p><p>Can you get the new US869 powder from Hodgdon? this would be a great one with the heavy bullets.</p><p></p><p>Anyway, just a thought on the shoulder angle, I personally feel anything 30 degrees and steeper is to much for stick powders in a 25 cal bore with this diameter of a case.</p><p></p><p>Just my opinion,</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 114242, member: 10"] Brian, I see what you are saying. If I may offer some food for thought about your new wildcat design. First off I think its a hell of an idea, basically the exact same thing as my 257 Allen Xpress based on the 300 Dakota case which is 2.550" long. Everything else is the same with the Xpress as it is with the Allen Mag, just a shorter case body. I will be building a light weight rifle in 257 Allen Xpress here soon for a hunting rifle and will be testing the 142 and 156 gr ULD RBBTs in this rifle. I have already tested the 6.5mm Allen Xpress which is the same thing as the 257 Xpress just necked up to 6.5mm. In a 26" barrel it will easily drive a 142 class bullet to 3300 fps so I suspect you will definately get to the 3150 fps level. As to my advice, because you are limited with the powders you can use, you may want to consider using a shoulder angle in the 25 to 28 degree range. 25 degrees is the same as the STW rounds. The reason I say this is because if you go to a steeper shoulder or even retain the 30 degree angle of the RUM case, you more then likely will run into powder bridging issues with any slow burning stick powder. I can not use any stick powders in my 257 Allen Mag for this reason. I can only use Ramshot Magnum, AA8700, H-870, US869 or WC872. H-50BMG is a very large kernal powder as is 20N29. I suspect you may have problems with these powders and powder bridging, the best change you would have to avoid this is a shallower shoulder angle. I know, not sexy or modern looking really but it may be vastly more functional. I still do not think H-50BMG and 20N29 would work but you could use powders such as Retumbo, RL-25 or similiar burn rate powders as these both perform very well in the STW. Can you get the new US869 powder from Hodgdon? this would be a great one with the heavy bullets. Anyway, just a thought on the shoulder angle, I personally feel anything 30 degrees and steeper is to much for stick powders in a 25 cal bore with this diameter of a case. Just my opinion, Kirby Allen(50) [/QUOTE]
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