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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Allen Magnums, Long Range Bullet Updates...
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<blockquote data-quote="brianwinzor" data-source="post: 37015" data-attributes="member: 1067"><p>Fifty Driver, Great to see the AM Magnum case project is progressing well. </p><p></p><p>I will be interested to see what the case capacities are for the final design, as that will determine whether the slowest powders, such as AR 2218 (H50BMG), H870, Viht24N41, and 20N29, are likely to achieve around 100% loading density with the 140 to 150 grain bullets.</p><p></p><p>After doing a little research on the web into velocities achieved by cases such as the 25/300 Win Mag, 25/8mm Rem Mag, 25/7mm STW, 6.53 Scramjet, I believe that your .257 AM has a very good chance of achieving the objectives you have listed.</p><p></p><p>The projected BC numbers on Richard Graves VLD bullets are certainly impressive and look forward to see how they perform. </p><p></p><p>I have ordered some of his 130 and 140 grain .257 cal flat base bullets. I intend to chronograph them in my 25/06 AI to see what velocities this "midget" case at the bottom end produces. Although I realise my 1 in 10 twist is unlikely to stabilise them. </p><p></p><p>Also, ordered some 85 grain & whatever is the heaviest he can produce in his 224 VLD dies, so I can order either 1 in 7.7 or 1in 7 twist barrel for my next .224 Clark.</p><p></p><p>My research into whoelse apart from PacNor produces 1 in 8 or 9 twist 257 cal barrels, found that:</p><p>Montana Rifleman list 8,10, &14 twist barrels. I note that they are in your State (Kallispell, Montana). Do you know of them, and what are their barrels like?</p><p>Shilen recommend a 1 in 9 for bullets over 100 grains, so I assume they produce it.</p><p>Badger Barrels appear to offer any calibre, contour and twist.</p><p>Krieger although only listing a 1 in 10 twist, has a note at the bottom of the webpage to call them regarding non standard twists, and bore and groove configurations.</p><p></p><p>Look forward to hearing more progress reports on your AM series. Regards, Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 37015, member: 1067"] Fifty Driver, Great to see the AM Magnum case project is progressing well. I will be interested to see what the case capacities are for the final design, as that will determine whether the slowest powders, such as AR 2218 (H50BMG), H870, Viht24N41, and 20N29, are likely to achieve around 100% loading density with the 140 to 150 grain bullets. After doing a little research on the web into velocities achieved by cases such as the 25/300 Win Mag, 25/8mm Rem Mag, 25/7mm STW, 6.53 Scramjet, I believe that your .257 AM has a very good chance of achieving the objectives you have listed. The projected BC numbers on Richard Graves VLD bullets are certainly impressive and look forward to see how they perform. I have ordered some of his 130 and 140 grain .257 cal flat base bullets. I intend to chronograph them in my 25/06 AI to see what velocities this "midget" case at the bottom end produces. Although I realise my 1 in 10 twist is unlikely to stabilise them. Also, ordered some 85 grain & whatever is the heaviest he can produce in his 224 VLD dies, so I can order either 1 in 7.7 or 1in 7 twist barrel for my next .224 Clark. My research into whoelse apart from PacNor produces 1 in 8 or 9 twist 257 cal barrels, found that: Montana Rifleman list 8,10, &14 twist barrels. I note that they are in your State (Kallispell, Montana). Do you know of them, and what are their barrels like? Shilen recommend a 1 in 9 for bullets over 100 grains, so I assume they produce it. Badger Barrels appear to offer any calibre, contour and twist. Krieger although only listing a 1 in 10 twist, has a note at the bottom of the webpage to call them regarding non standard twists, and bore and groove configurations. Look forward to hearing more progress reports on your AM series. Regards, Brian. [/QUOTE]
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