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Posted: 8/9/2013 11:58:56 AM EDT
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I did up a run of about 100 LC brass/CCI 450 Primers/H335 cartridges.
I had to swage the brass and I think it wasn't good enough on the cartridges. Instead of the primers being seated slightly below flush they are right at flush. All the cartridges pass the case measurement test. None of the primers are above flush, not even a hair. If I was using harder CCI 41s I probably wouldn't worry about it too much. I am just wonder if the chances of slam fire is so great I should pull the powder and bullets and can the cases. It seems to me that I have done a few before that the primers were flush and didn't have a problem. Any words of wisdom from anybody with experience with flush primers? |
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I am of the opinion that CCI 450's and even 400's will be just fine if you seat the primers flush. I have never had a slamfire from a 400 in countless AR's.
Thats not to say it cant happen, but rather that it hasnt happened to me. There are many pieces of fired brass out there that wont seat a primer deeper than flush if the pockets arent uniformed and cleaned. |
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Quoted:
There's only one way to know for sure, unfortunately. If they're true 'flush' then you should be ok, but I'm just guessing. This is one reason to buy a Sinclair carbide primer pocket uniformer, a cordless drill and a six pack. Chris You can use one of these, but some folks would say that was overkill. Try laying a thin straight-edge like a machinists scale over the diameter of the head face. See if any light leaks under the crack between the primer face and the straight-edge. 
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What did you use to seat them? You could try to re-seat with a reloading press with perhaps a little more leverage, but be very careful, not too much pressure. I have done it before.
Or, slam fires are very rare. So if they are truly flush, you should be ok. Just try to improve prep next time, if you can. |
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Quoted:
What did you use to seat them? You could try to re-seat with a reloading press with perhaps a little more leverage, but be very careful, not too much pressure. I have done it before. Or, slam fires are very rare. So if they are truly flush, you should be ok. Just try to improve prep next time, if you can. This. Domed primer cups can be flattened a little to pick up another 2 or 3 thousandths. |
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Quoted:
You could try to re-seat with a reloading press with perhaps a little more leverage, but be very careful, not too much pressure. I have done it before. . If I had to choose between a possible slam-fire, or a possible primer detonation in a live round at my bench, I would choose the slam-fire. |
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Quoted:
If I had to choose between a possible slam-fire, or a possible primer detonation in a live round at my bench, I would choose the slam-fire. Quoted:
Quoted:
You could try to re-seat with a reloading press with perhaps a little more leverage, but be very careful, not too much pressure. I have done it before. . If I had to choose between a possible slam-fire, or a possible primer detonation in a live round at my bench, I would choose the slam-fire. Oops! I agree with steve, don't do this with a live round. Mea Culpa! 
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