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Hunting
Long Range Hunting & Shooting
257 STW or 6.5 STW
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<blockquote data-quote="Fiftydriver" data-source="post: 133004" data-attributes="member: 10"><p>I like to think I build big game rifles that shoot like BR rifles. That said, when I design a reamer, I design it for accuracy big game hunting. I do not like to turn case necks but many do. Because of this, I design my reamers so that they work with the 7mm STW brass necked down to 257 with no turning needed. If you want to take a light truing cut on the case necks they still offer a very quality neck to chamber fit but not needed.</p><p></p><p>The BC numbers I have come up with are from measuring actual bullet drop out to ranges in excess of 1000 yards with the 142 and 156 gr ULD RBBT and out to 800 yard with the 130 gr ULD Flat base.</p><p></p><p>As such, realize, these are just the numbers I had to use in my ballistic program to get the generated model to match up with actual bullet flight using my muzzle velocity and three drop values at three different ranges. I am not saying these are scientific BCs, just what allow me to hit what I shoot at in real world shooting.</p><p></p><p>130 gr ULD FB...............0.520</p><p>142 gr ULD RBBT.............0.710</p><p>156 gr ULD RBBT.............0.820</p><p></p><p>Also remember these were at velocities out of my 257 Allen Magnum. THe velocities were 3650, 3510 and 3330 fps respectively so they may be slightly different at the lower velocities of the 257 STW but not much.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 133004, member: 10"] I like to think I build big game rifles that shoot like BR rifles. That said, when I design a reamer, I design it for accuracy big game hunting. I do not like to turn case necks but many do. Because of this, I design my reamers so that they work with the 7mm STW brass necked down to 257 with no turning needed. If you want to take a light truing cut on the case necks they still offer a very quality neck to chamber fit but not needed. The BC numbers I have come up with are from measuring actual bullet drop out to ranges in excess of 1000 yards with the 142 and 156 gr ULD RBBT and out to 800 yard with the 130 gr ULD Flat base. As such, realize, these are just the numbers I had to use in my ballistic program to get the generated model to match up with actual bullet flight using my muzzle velocity and three drop values at three different ranges. I am not saying these are scientific BCs, just what allow me to hit what I shoot at in real world shooting. 130 gr ULD FB...............0.520 142 gr ULD RBBT.............0.710 156 gr ULD RBBT.............0.820 Also remember these were at velocities out of my 257 Allen Magnum. THe velocities were 3650, 3510 and 3330 fps respectively so they may be slightly different at the lower velocities of the 257 STW but not much. Kirby Allen(50) [/QUOTE]
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257 STW or 6.5 STW
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