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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Heaviest bullet for 22-250?
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<blockquote data-quote="benchracer" data-source="post: 807614" data-attributes="member: 22069"><p>I didn't realize that there is a list of some bullet lengths compiled on the JBM website. Using what I could find on that list, I plugged some numbers into the calculator on the Berger website. All calculations were run a 59*F and 0 Ft. Altitude. If you plug in expected temperature and altitude for where you hunt, you will obviously get more accurate numbers for your conditions.</p><p> </p><p>Here is some info to muddy the waters a bit on the subject of what bullets will stabilize from a 14 twist 22-250:</p><p> </p><p> </p><p>Sierra 55g Game King (length .724) @ 3600 SG=1.1 (marginally stable)</p><p> </p><p>Sierra 60g HP Varminter (length .776) @ 3600 SG=.99 (unstable)</p><p> </p><p>Sierra 63g Varminter (length .755) @ 3500 SG=1.11 (marginally stable)</p><p> </p><p>Hornady 55g Spire Point (length .715) @ 3600 SG=1.14 (marginally stable)</p><p> </p><p>Hornady 60g Spire Point (length .700) @ 3600 SG=1.33 (marginally stable)</p><p>Hornady 60g Spire Point (length .750) @ 3600 SG=1.09 (marginally stable)</p><p> </p><p>Nosler 60g Partition (length .790) @ 3600 SG=.94 (unstable)</p><p> </p><p>Barnes 45g TSX FB (length .698) @ 3900 SG=1.03 (marginally stable)</p><p> </p><p>Barnes 50g TSX FB (length .736) @ 3700 SG=.97 (unstable)</p><p> </p><p> </p><p>A few things are worth noting here. First, the JBM website says the Hornady 60g Spire Point is shorter in length than the 55g bullet of the same design. I think that length measurement is suspect. I did some digging and found where someone had measured their 60g Spire Point at .750. I plugged in and ran both sets of numbers for that bullet.</p><p> </p><p>Sierra states that the 60g HP Varminter is designed to work in 14 twist 22-250's and Swifts and that it does just that. The calculator says no, but just barely. I believe there is likely some wiggle room here.</p><p> </p><p>I also ran across a post from someone who had called the Barnes tech line to ask about the 45g and 50g TSX FB bullets in a 14 twist. According to that individual, Barnes technical personnel stated that the 45g and 50g TSX FB bullets were specifically designed for 14 twist barrels in 22-250 and .220 Swift and that extensive testing had shown that both bullets will reliably stabilize in a 14 twist. Barnes online load data appears to back that up. Note also that the velocities I plugged in to the Berger calculator for these two bullets are notably conservative compared to the Barnes data. </p><p> </p><p>One final note on the Barnes bullets is that I got my length information from the MidwayUSA website. That was the only place I could find it. Sometimes their posted information is accurate. Sometimes it's not. I have been bitten before when using data taken from Midway.</p></blockquote><p></p>
[QUOTE="benchracer, post: 807614, member: 22069"] I didn't realize that there is a list of some bullet lengths compiled on the JBM website. Using what I could find on that list, I plugged some numbers into the calculator on the Berger website. All calculations were run a 59*F and 0 Ft. Altitude. If you plug in expected temperature and altitude for where you hunt, you will obviously get more accurate numbers for your conditions. Here is some info to muddy the waters a bit on the subject of what bullets will stabilize from a 14 twist 22-250: Sierra 55g Game King (length .724) @ 3600 SG=1.1 (marginally stable) Sierra 60g HP Varminter (length .776) @ 3600 SG=.99 (unstable) Sierra 63g Varminter (length .755) @ 3500 SG=1.11 (marginally stable) Hornady 55g Spire Point (length .715) @ 3600 SG=1.14 (marginally stable) Hornady 60g Spire Point (length .700) @ 3600 SG=1.33 (marginally stable) Hornady 60g Spire Point (length .750) @ 3600 SG=1.09 (marginally stable) Nosler 60g Partition (length .790) @ 3600 SG=.94 (unstable) Barnes 45g TSX FB (length .698) @ 3900 SG=1.03 (marginally stable) Barnes 50g TSX FB (length .736) @ 3700 SG=.97 (unstable) A few things are worth noting here. First, the JBM website says the Hornady 60g Spire Point is shorter in length than the 55g bullet of the same design. I think that length measurement is suspect. I did some digging and found where someone had measured their 60g Spire Point at .750. I plugged in and ran both sets of numbers for that bullet. Sierra states that the 60g HP Varminter is designed to work in 14 twist 22-250's and Swifts and that it does just that. The calculator says no, but just barely. I believe there is likely some wiggle room here. I also ran across a post from someone who had called the Barnes tech line to ask about the 45g and 50g TSX FB bullets in a 14 twist. According to that individual, Barnes technical personnel stated that the 45g and 50g TSX FB bullets were specifically designed for 14 twist barrels in 22-250 and .220 Swift and that extensive testing had shown that both bullets will reliably stabilize in a 14 twist. Barnes online load data appears to back that up. Note also that the velocities I plugged in to the Berger calculator for these two bullets are notably conservative compared to the Barnes data. One final note on the Barnes bullets is that I got my length information from the MidwayUSA website. That was the only place I could find it. Sometimes their posted information is accurate. Sometimes it's not. I have been bitten before when using data taken from Midway. [/QUOTE]
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Heaviest bullet for 22-250?
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