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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
High BC .257 bullets?
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<blockquote data-quote="brianwinzor" data-source="post: 123848" data-attributes="member: 1067"><p>Skip AI, Yes! I am definitely saying that 3,400 fps is way too hot for the 115 grain bullet in a 24 inch barrel, and at least 100 fps over what is normally a safe maximum. 3,400 fps may be just achievable in a 30 inch barrel.</p><p></p><p>I found that with the Nosler 115BT, 63.0 grains of H1000 gave consistent sub 0.5 moa accuracy, velocities in the 3,240 - 3,275 range (depending on temp), and life was sweet. </p><p></p><p>However, I ran out of my supply of H1000, and even though ADI AR2217 is supposed to be the same powder, I paid the price for not working up again, as it took just 1 shot, 3,482 fps, and a blown primer with 63.0 grains of AR2217 to quickly discover that there is significant lot to lot variation. Now 60.0 grains became the maximum, but velocity is down and accuracy isn't the same. </p><p></p><p>I then switched to using 62.0/Reloader 25 as on first test it gave 3,292 fps at maximum pressure. However, I have now abandoned that powder with this bullet weight, as since the original test it is all over the place, as velocities are varying by as much as 100 - 150 fps depending on temperature.</p><p></p><p>Since then I have mainly been using Richard Graves Wildcat 125 grain ULD's. However, if I did for some reason return to using the Nosler 115BT, I would try some AR2225 (HRetumbo) next as I think there is a reasonable chance of </p><p>cramming enough in (about 64.0 grains) to produce enough pressure and velocity.</p><p></p><p>I have done a lot testing with my custom 25/06AI (SakoL61R, Shilen 24 in barrel, Fajen Laminated stock) to see what the case is capable of, but have been using it on medium game here in Oz. If you are interested I could email you a file with the data I have collated on bullets from 100 - 156 grains. Regards, Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 123848, member: 1067"] Skip AI, Yes! I am definitely saying that 3,400 fps is way too hot for the 115 grain bullet in a 24 inch barrel, and at least 100 fps over what is normally a safe maximum. 3,400 fps may be just achievable in a 30 inch barrel. I found that with the Nosler 115BT, 63.0 grains of H1000 gave consistent sub 0.5 moa accuracy, velocities in the 3,240 - 3,275 range (depending on temp), and life was sweet. However, I ran out of my supply of H1000, and even though ADI AR2217 is supposed to be the same powder, I paid the price for not working up again, as it took just 1 shot, 3,482 fps, and a blown primer with 63.0 grains of AR2217 to quickly discover that there is significant lot to lot variation. Now 60.0 grains became the maximum, but velocity is down and accuracy isn't the same. I then switched to using 62.0/Reloader 25 as on first test it gave 3,292 fps at maximum pressure. However, I have now abandoned that powder with this bullet weight, as since the original test it is all over the place, as velocities are varying by as much as 100 - 150 fps depending on temperature. Since then I have mainly been using Richard Graves Wildcat 125 grain ULD's. However, if I did for some reason return to using the Nosler 115BT, I would try some AR2225 (HRetumbo) next as I think there is a reasonable chance of cramming enough in (about 64.0 grains) to produce enough pressure and velocity. I have done a lot testing with my custom 25/06AI (SakoL61R, Shilen 24 in barrel, Fajen Laminated stock) to see what the case is capable of, but have been using it on medium game here in Oz. If you are interested I could email you a file with the data I have collated on bullets from 100 - 156 grains. Regards, Brian. [/QUOTE]
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High BC .257 bullets?
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