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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="Hugnot" data-source="post: 2216204" data-attributes="member: 115658"><p>Take it to a competent gun smith & get a chamber cast - .257 R factory loads are the pressure light side. I think the case failures indicate a sloppy chamber, not excess head space. Excess head space would be indicated by head separations or impeding head separations, like cracks across the brass. Lots of sloppy gun smith work out there like rechamber jobs using drill presses.</p><p></p><p>The brass failures shown indicate stretching across the brass not along the brass and that would indicate a sloppy chamber - failures just above the web & at the shoulder. I have seen some examples of things like this, like rechamber jobs done using a drill press. As mentioned, Savage headspace issues may be fixed by screwing the barrel into the receiver and then locking it up with the barrel nut.</p><p></p><p>Consider the cost of buying expensive and scarce primers & brass against the cost of a new barrel. The results might just be more destroyed/unusable brass and no good ammo. A new barrel would cost $400-$500. No easy fix for a sloppy chamber. Brass from Quality might go about $1.00 each.</p><p></p><p>I have fire formed using the COW method - 6mm AI, .257 AI, .280 R from .270W, & .375-.338 from 7mmRM & .338W. Getting a good crush fit is essential. No head separations. As mentioned the AI case will headspace some .004 shorter than the parent case. Coffee grounds sound like an improvement over COW.</p><p></p><p>Are the formed brass dimensions same as what is shown here?</p><p></p><p>[URL unfurl="true"]https://load-data.nosler.com/load-data/257-roberts-ackley-improved/[/URL]</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2216204, member: 115658"] Take it to a competent gun smith & get a chamber cast - .257 R factory loads are the pressure light side. I think the case failures indicate a sloppy chamber, not excess head space. Excess head space would be indicated by head separations or impeding head separations, like cracks across the brass. Lots of sloppy gun smith work out there like rechamber jobs using drill presses. The brass failures shown indicate stretching across the brass not along the brass and that would indicate a sloppy chamber - failures just above the web & at the shoulder. I have seen some examples of things like this, like rechamber jobs done using a drill press. As mentioned, Savage headspace issues may be fixed by screwing the barrel into the receiver and then locking it up with the barrel nut. Consider the cost of buying expensive and scarce primers & brass against the cost of a new barrel. The results might just be more destroyed/unusable brass and no good ammo. A new barrel would cost $400-$500. No easy fix for a sloppy chamber. Brass from Quality might go about $1.00 each. I have fire formed using the COW method - 6mm AI, .257 AI, .280 R from .270W, & .375-.338 from 7mmRM & .338W. Getting a good crush fit is essential. No head separations. As mentioned the AI case will headspace some .004 shorter than the parent case. Coffee grounds sound like an improvement over COW. Are the formed brass dimensions same as what is shown here? [URL unfurl="true"]https://load-data.nosler.com/load-data/257-roberts-ackley-improved/[/URL] [/QUOTE]
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Question about Fire Forming 257 bobs into 257 AI
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