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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
257 Allen Magnum progress continues to another level...
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<blockquote data-quote="Fiftydriver" data-source="post: 57555" data-attributes="member: 10"><p><strong>Re: . In past tests the STW proved to produce about 47 fps more velocity p</strong></p><p></p><p>B1g_b0re,</p><p></p><p>I would agree that this 47 fps gain per inch of barrel length is alot. I got this from actually shooting three rifles I built this summer for customers. All three used Lilja #6 contour, 3 groove, 1-10" stainless barrels. All were chambered for the 257 STW using the same reamer for all three.</p><p></p><p>The only difference was barrel length, one was a 27", one a 28 and one a 30" barreled rifle.</p><p></p><p>Using the 130 gr Wildcat Bonded Core FBHP with the same load each, 76.0 gr Retumbo over a Fed-215 adn all seated to the same over all length, the results were as followed: This was for five a five shot string</p><p></p><p>27" barrel</p><p>3317 fps</p><p></p><p>28"</p><p>3368 fps</p><p></p><p>30"</p><p>3455 fps</p><p></p><p>I also tested the STW with the 100 gr Bonded Core FBHP and these were the velocity results with the same load:</p><p></p><p>27"</p><p>3853 fps</p><p></p><p>28"</p><p>3910 fps</p><p></p><p>30"</p><p>3955</p><p></p><p>I do not know what the velocity increase would be over 30", I know it will drop dramatically past this point but from what I actually got testing the 257 STW, +45 fps per inch of barrel length is the norm going from 26 to 30".</p><p></p><p>The 257 AM has an even larger case capacity and will be using significantly slower burning powders for the 145 and 150 class bullets so I am predicting around the same velocity increases.</p><p></p><p>We will have to see though what happens when the bullets get in the air!!! /ubbthreads/images/graemlins/smile.gif</p><p></p><p>Good Shooting!!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 57555, member: 10"] [b]Re: . In past tests the STW proved to produce about 47 fps more velocity p[/b] B1g_b0re, I would agree that this 47 fps gain per inch of barrel length is alot. I got this from actually shooting three rifles I built this summer for customers. All three used Lilja #6 contour, 3 groove, 1-10" stainless barrels. All were chambered for the 257 STW using the same reamer for all three. The only difference was barrel length, one was a 27", one a 28 and one a 30" barreled rifle. Using the 130 gr Wildcat Bonded Core FBHP with the same load each, 76.0 gr Retumbo over a Fed-215 adn all seated to the same over all length, the results were as followed: This was for five a five shot string 27" barrel 3317 fps 28" 3368 fps 30" 3455 fps I also tested the STW with the 100 gr Bonded Core FBHP and these were the velocity results with the same load: 27" 3853 fps 28" 3910 fps 30" 3955 I do not know what the velocity increase would be over 30", I know it will drop dramatically past this point but from what I actually got testing the 257 STW, +45 fps per inch of barrel length is the norm going from 26 to 30". The 257 AM has an even larger case capacity and will be using significantly slower burning powders for the 145 and 150 class bullets so I am predicting around the same velocity increases. We will have to see though what happens when the bullets get in the air!!! [img]/ubbthreads/images/graemlins/smile.gif[/img] Good Shooting!!! Kirby Allen(50) [/QUOTE]
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257 Allen Magnum progress continues to another level...
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