CCI # 34 Military Rifle Primers

slushee

slushee

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I load .308 win for an M14, and I was interested in the military primers made by CCI. I sent an email to them to get more information, and this is what I got about an hour later:

"Thank you for your question.

CCI #34 primers are 'ballistically' equivalent to a CCI 250 Large Rifle
'Magnum' primer. #34's should not be substituted for CCI 200's.

The CCI #34 primer was designed to help prevent slam fires in military
style semi-autos. The distance between the tip of the anvil and the
bottom of the primer cup is greater on a #34 primer, lessening the
chance of a slam fire. Linda"

So I was under the impression the primer was a replacement for Large Rifle Primers like those used in .308 win, but apparently they are not.

I am curiuos though, has anyone tried these primers in .308 win? I personally will not after hearing CCI say not too, but I am sure I have read on here that there are some who do.
 
They are a replacement, but they are a magnum primer.

I'm sure someone will correct me if I'm wrong, but as far as I know there's nothing wrong with using magnum primers with non-magnum powder, only the other way around. I wonder why CCI would say not to use #34 instead of #200?
I haven't shot this particular primer, but I've used the #41 small rifle version. They are magnum primers as well, and I've shot them with both magnum and non-magnum powders.
 
BC_Guy said:
I'm sure someone will correct me if I'm wrong, but as far as I know there's nothing wrong with using magnum primers with non-magnum powder, only the other way around.
Click to expand...

Nothing wrong, except for the supposed slight increase in pressure caused by the hotter primer. I've read on these pages that one should back off on their powder charge a bit if substituting regular primers with magnum primers.

Anyone working for a primer manufacturer will tell you not to use mag primers instead of regular primers, if only to avoid liability.
 
I know guys who use them in .308, however I would listen to the advice to back down and rework up the charge, you should in theory get a pressure jump with a magnum over regular primer, I wouldn't go up to max loads if your book specifies the loads were tested with regular primers.

Oh and it's not a bad idea to use them, I didn't quite see it, but i heard a slam fire once, and the action was not closed, I found the brass and the shoulder was pushed forward some, fortunately the case didn't split, it created a seal and the shooter and rifle were fine.
 
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