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Rifles, Reloading, Optics, Equipment
Reloading
Question about flattened primers?
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<blockquote data-quote="boomtube" data-source="post: 437930" data-attributes="member: 9215"><p>You probably don't have a pressure problem, more commonly it's a FL sizing problem from setting the shoulder back too far. </p><p> </p><p>Normal case stretch during firing pushes the case back over the primer but the chamber pressure can prevent it from sliding back in. So, the top gets squashed a little. FL sizing <u>correctly</u> controls case stretch and your primers won't pop out and then get "flattened" with normal pressures.</p><p> </p><p>Do a test. FL size a case exactly as you normally do. Prime and fire it, then examine the fired primer. If it's standing proud, out higher than the case head, you need to back your sizer up that far; measure it with your caliper. A 1/8th turn moves the die 9 thou.</p></blockquote><p></p>
[QUOTE="boomtube, post: 437930, member: 9215"] You probably don't have a pressure problem, more commonly it's a FL sizing problem from setting the shoulder back too far. Normal case stretch during firing pushes the case back over the primer but the chamber pressure can prevent it from sliding back in. So, the top gets squashed a little. FL sizing [U]correctly[/U] controls case stretch and your primers won't pop out and then get "flattened" with normal pressures. Do a test. FL size a case exactly as you normally do. Prime and fire it, then examine the fired primer. If it's standing proud, out higher than the case head, you need to back your sizer up that far; measure it with your caliper. A 1/8th turn moves the die 9 thou. [/QUOTE]
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Reloading
Question about flattened primers?
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