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primer pocket depth?
 Moderated by: Timberghozt, Rockydog, fryboy
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 Posted: Sat Sep 29th, 2012 11:51 PM
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turbo87coupe
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What should be the depth of a primer pocket? Would or should a small pistol pocket and small rifle pocket be the same depth? I recently aquired an RCBS case prep center with a small primer pocket uniformer/ cutter bit. It would be approx .165 deep if I were to trim the pocket until the brass shoulders. I noticed that on my fired Federal cases(Lake City 5.56) this is a noticable difference in depth. Am I not supposed to ream or cut pocket until it shoulders?



 Posted: Sun Sep 30th, 2012 12:25 AM
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Rockydog
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Small rifle and pistol primers are the same height. Pistol primers are usually softer and shouldn't be used in Rifle loads. Large Rifle primers are taller than large Pistol Primers. Here's a chart with primer cross reference and dimensions. RD

http://www.lasc.us/primerchart.htm



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 Posted: Sun Sep 30th, 2012 12:40 AM
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turbo87coupe
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Thank you for the chart. I know you cant use pistol in rifle and vice versa. I am just curious why this primer pocket cutter cuts so deep? Also was thinking I could make a washer for a stop to set it at the right depth. Or if I really even need to cut them. I don't see why you couldn't just clean and go



 Posted: Sun Sep 30th, 2012 12:47 AM
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Rockydog
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Turbo, Unless they've been reamed or swaged LC cases,some Federal cases, some PMC cases and most military cases have swaged primers that leave a ring that must be removed prior to reloading. Some guys swage them out, some guys cut them out with a special tool, others just use a drill bit in a drill press just touched to the back of the case. RD



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 Posted: Sun Sep 30th, 2012 12:50 AM
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turbo87coupe
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How do I tell if my cases have this? I only have Lake City ammo on hand so I have nothing to compare it to.



 Posted: Sun Sep 30th, 2012 01:05 AM
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OldStuffer
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LC 5.56 will have a circle, a ring, impressed into the base of the case circling the primer pocket.

Take a caliper and measure the pocket. A non-crimped pocket should be just a small amount smaller than the primer (a thousandth or so, maybe 2 I suppose).
The crimped cases will be several thou smaller YET which is why it is hard to get the primers out but impossible to put a primer back in until the crimp is removed.



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 Posted: Sun Sep 30th, 2012 02:06 AM
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turbo87coupe
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OldStuffer wrote:
LC 5.56 will have a circle, a ring, impressed into the base of the case circling the primer pocket.

Take a caliper and measure the pocket. A non-crimped pocket should be just a small amount smaller than the primer (a thousandth or so, maybe 2 I suppose).
The crimped cases will be several thou smaller YET which is why it is hard to get the primers out but impossible to put a primer back in until the crimp is removed.


Thank you very much



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