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Posted: 1/25/2009 1:14:14 PM EDT
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After processing a batch of LC .223 brass and seating the primers, I noticed that the
primers are flush with the head of the case. Factory loads are about .004 below the head. Are my primed cases O.K. ? If not, what am I doing wrong? I swaged the cases and using CCI 400 SRP's. I also noticed the same thing on my 9mm Win. reloads. Any advice greatly appreciated. Oh yea, I'm using both Lee hand primer and the primer attachment on my Rockchucker. |
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Here is a pic of how I check every round I load for high pimers.
Hold ammo box at an angle under good light. 
Look for a small sliver of brass between primer and case head. Front row, 4th case from the right, see the sliver of brass? With a high primer, no sliver of brass. Takes me about 30 seconds to check 50 rounds, then dump rounds in an ammo can for storage. |
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A PP uniformerr is a good idea. The bottom of the PP isn't square as they are made by a punch with a slight radius on the bottom corner. CCI primers tend to have square edges on the cup which is good for accuracy if you use a PP uniformer. If not, they will be just flush.
It is one of those things you need to do once to the brass. |
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It helps to seat below flush.......it's part of preventing "slam fires."
From the Speer manual.......... Repriming is a simple, but critical, step that reloaders often do not give enough attention to. In order to gain optimum primer sensitivity, it must be seated firmly to the bottom of the primer pocket. But this doesn't mean using so much force that the primer cup is deformed. When primers are properly seated, the top of the primer is from .005" to .008" below flush with the case head. The purpose of this is to assure that the primer anvil legs are in firm contact with the bottom of the primer pocket. Aloha, Mark |
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