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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="Seabeeken" data-source="post: 2216829" data-attributes="member: 68015"><p>I had 1 Hornady case separate like that while forming 250ai brass. New brass is often under size and the firing pin can drive the case forward slightly where it expands, grip the chamber tight enough that the case head moves back and separates. I did 2 things to stop this and never had an issue again. I start with a very clean chamber and very very lightly oil the chamber to prevent the case from gripping the case walls. When I do this, I run moderate loads as bolt thrust increases with an oily chamber.</p><p>always check inside the case with a paper clip for head sep too. If forming to Ackley, your case should get slightly shorter which means the brass flowed from the neck area to fill out the chamber. This is what you want because When it flows from the back it can cause head sep. in this case the case length doesn't change or lengthens</p></blockquote><p></p>
[QUOTE="Seabeeken, post: 2216829, member: 68015"] I had 1 Hornady case separate like that while forming 250ai brass. New brass is often under size and the firing pin can drive the case forward slightly where it expands, grip the chamber tight enough that the case head moves back and separates. I did 2 things to stop this and never had an issue again. I start with a very clean chamber and very very lightly oil the chamber to prevent the case from gripping the case walls. When I do this, I run moderate loads as bolt thrust increases with an oily chamber. always check inside the case with a paper clip for head sep too. If forming to Ackley, your case should get slightly shorter which means the brass flowed from the neck area to fill out the chamber. This is what you want because When it flows from the back it can cause head sep. in this case the case length doesn’t change or lengthens [/QUOTE]
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Question about Fire Forming 257 bobs into 257 AI
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