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Rifles, Reloading, Optics, Equipment
Reloading
Anyone shoot a 257 Roberts Ackley?
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<blockquote data-quote="MNbogboy" data-source="post: 1597549" data-attributes="member: 18849"><p>Also late to this one. Have chambered & built three 257 Bob AIs. These are all 10 twist & loved 100 grain Nosler ballistic tips & h4831sc. All three barrels shoot 1/2 to 3/4 moa between 3100- 3200 fps.</p><p></p><p>Brass is biggest obstacle, having formed it from 257 Roberts, 7mm x 57 & 8 x 57. Problem with the Roberts & 7mm cases always end up with short necks.</p><p>Also formed it down from 25-06, 270 & 30-06 (three later result in proper length necks but are more labor intensive to form).</p><p>Best results however came from 8mm x 57 mauser cases. Necks come out to length & depending on brass & chamber neck turning may only be optional. I use a 260 body die to bring the 8mm cases to "crush fit" length and then partial neck size them with the FL Ackley die. Fireform with "full" (47 gr) of h4831sc and 100gr bullets.</p><p>I use exactly same method with my 3 other Ackleys (6.5/257 Bob Ackley 40deg).</p><p>Good luck & have fun.</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1597549, member: 18849"] Also late to this one. Have chambered & built three 257 Bob AIs. These are all 10 twist & loved 100 grain Nosler ballistic tips & h4831sc. All three barrels shoot 1/2 to 3/4 moa between 3100- 3200 fps. Brass is biggest obstacle, having formed it from 257 Roberts, 7mm x 57 & 8 x 57. Problem with the Roberts & 7mm cases always end up with short necks. Also formed it down from 25-06, 270 & 30-06 (three later result in proper length necks but are more labor intensive to form). Best results however came from 8mm x 57 mauser cases. Necks come out to length & depending on brass & chamber neck turning may only be optional. I use a 260 body die to bring the 8mm cases to "crush fit" length and then partial neck size them with the FL Ackley die. Fireform with "full" (47 gr) of h4831sc and 100gr bullets. I use exactly same method with my 3 other Ackleys (6.5/257 Bob Ackley 40deg). Good luck & have fun. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Anyone shoot a 257 Roberts Ackley?
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