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Rifles, Reloading, Optics, Equipment
Reloading
New 257 STW
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<blockquote data-quote="Fiftydriver" data-source="post: 108618" data-attributes="member: 10"><p>Yes, a bit of freebore will free things up significantly that is for sure.</p><p></p><p>I used Retumbo exclusively in my personal 257 STW rifles when I was hunting with that round but that was with 130 gr bullets which I loaded to just shy of 3500 fps.</p><p></p><p>With about 50% of the rifles I have tested Retumbo in with the 100 gr bullet weights, powder bridging was an issue which is why the need for ball powder. With the heavier pills this was not an issue. Don;t know why to be honest but with the 130s, Retumbo was very well behaved and shot very well. Sub 2" groups at 500 yards was pretty common.</p><p></p><p>From what I have seen with powders like AA8700 in the STW, I would say US869 will be to slow burning to get top velocities and I would suspect powder fouling will be an issue because you will not be able to get chamber pressures up high enough with a 100 gr bullet to get a good clean burn.</p><p></p><p>May be wrong but this is what I have seen in the STW with powders such as AA8700 and H-870.</p><p></p><p>With heavy bullets these powders work very well. Starting ar 120 gr and up to 156 gr, they may be the very best powder choices out there for the real big 257 magnums.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 108618, member: 10"] Yes, a bit of freebore will free things up significantly that is for sure. I used Retumbo exclusively in my personal 257 STW rifles when I was hunting with that round but that was with 130 gr bullets which I loaded to just shy of 3500 fps. With about 50% of the rifles I have tested Retumbo in with the 100 gr bullet weights, powder bridging was an issue which is why the need for ball powder. With the heavier pills this was not an issue. Don;t know why to be honest but with the 130s, Retumbo was very well behaved and shot very well. Sub 2" groups at 500 yards was pretty common. From what I have seen with powders like AA8700 in the STW, I would say US869 will be to slow burning to get top velocities and I would suspect powder fouling will be an issue because you will not be able to get chamber pressures up high enough with a 100 gr bullet to get a good clean burn. May be wrong but this is what I have seen in the STW with powders such as AA8700 and H-870. With heavy bullets these powders work very well. Starting ar 120 gr and up to 156 gr, they may be the very best powder choices out there for the real big 257 magnums. Kirby Allen(50) [/QUOTE]
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New 257 STW
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