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Rifles, Reloading, Optics, Equipment
Reloading
Flattened Primers? Help?
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<blockquote data-quote="boomtube" data-source="post: 566143" data-attributes="member: 9215"><p>You're probably overly FL sizing your cases and setting the shoulder too far back. That's the major cause of flat, or 'muffin top", primer cups, not pressure. Try this:</p><p> </p><p>1. Size a case normally</p><p>2. Prime normally</p><p>3. Chamber the primed case and fire it</p><p>4. Remove the case and see how proud of the case head the primer sits.</p><p> </p><p>If the primer is more than 2 thou high you need to reduce the amount of FL sizing you're doing. Understand we move the shoulder about .072" each full turn of a die; a 1/16<u>th</u> turn moves the shoulder about 4.5 thou (Some 2/3s of the normal full range of headspace tolerance!) so make SMALL die changes until you get it right. Get it right and your primers won't flatten and you'll greatly reduce the potential for stretching cases into a head seperation.</p></blockquote><p></p>
[QUOTE="boomtube, post: 566143, member: 9215"] You're probably overly FL sizing your cases and setting the shoulder too far back. That's the major cause of flat, or 'muffin top", primer cups, not pressure. Try this: 1. Size a case normally 2. Prime normally 3. Chamber the primed case and fire it 4. Remove the case and see how proud of the case head the primer sits. If the primer is more than 2 thou high you need to reduce the amount of FL sizing you're doing. Understand we move the shoulder about .072" each full turn of a die; a 1/16[U]th[/U] turn moves the shoulder about 4.5 thou (Some 2/3s of the normal full range of headspace tolerance!) so make SMALL die changes until you get it right. Get it right and your primers won't flatten and you'll greatly reduce the potential for stretching cases into a head seperation. [/QUOTE]
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Flattened Primers? Help?
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