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Rifles, Reloading, Optics, Equipment
Reloading
Question about Fire Forming 257 bobs into 257 AI
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<blockquote data-quote="MagnumManiac" data-source="post: 2214792" data-attributes="member: 10755"><p>Yes, COW method is a fast pistol/shotgun powder at about 1/3rd of a normal load, then COW on top and a twist of TP.</p><p>You may need to use a false shoulder if your NEW brass does not close with some resistance on the bolt.</p><p>I used to use a 6.5 expander and expand all the necks in the 257 die, then put the 257 expander back in and create a false shoulder by gradually necking down until a case just allowed the bolt to close with some resistance. Even though my chamber had .005" negative headspace, I would occasionally get head separations. It wasn't caused by the die, and I still got a few every now and then. My Dad owns that rifle now.</p><p>Those splits in your brass are not from excessive headspace, maybe the chamber is on the large side near the web...only way to know is measuring unfired brass against fired brass.</p><p>Hope this helps you get some brass formed without issue.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2214792, member: 10755"] Yes, COW method is a fast pistol/shotgun powder at about 1/3rd of a normal load, then COW on top and a twist of TP. You may need to use a false shoulder if your NEW brass does not close with some resistance on the bolt. I used to use a 6.5 expander and expand all the necks in the 257 die, then put the 257 expander back in and create a false shoulder by gradually necking down until a case just allowed the bolt to close with some resistance. Even though my chamber had .005” negative headspace, I would occasionally get head separations. It wasn’t caused by the die, and I still got a few every now and then. My Dad owns that rifle now. Those splits in your brass are not from excessive headspace, maybe the chamber is on the large side near the web...only way to know is measuring unfired brass against fired brass. Hope this helps you get some brass formed without issue. Cheers. [/QUOTE]
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Question about Fire Forming 257 bobs into 257 AI
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