CCI #34 primers / cci 34 primers
CCI #34 7.62mm Military Primers
Weight 1.1 lbs
CCI Primers, Caps, and Bullets
The CCI #34 primer is less impact sensitive. I was told by somebody at CCI that primer anvil’s legs/arms,”angle” is different. Somebody else told me that difference is the avil legs/arms are a different length, which could be saying the same thing./ A change in angle may require a change of length as the primer cups are the same height, or a change in length may require a change in angle. I was told the primer cups are the same thickness. I think the small rifle version, the #CCI 41 primer, may have a thicker cup than the CCI 450, which is already thicker than the CCI 400 primer cup.
Comparing loads between the CCI 250 and the CCI #34 primers, I always get better accuracy with the CCI 250 primers than the CCI #34 primers. I don’t know if that is due to design or due to the way CCI #34 primers are sold in bulk in plain boxes and they may just not have the same quality control.
cci 34 primers
Magnum primers are recommended for my.375 H&H ONLY. I would be extremely cautious if forced to use them elsewhere. They are necessary for the .375 to get the proper combustion and velocity. I tried large rifle primers in a couple of cartridges. Difference of about 200/300 FPS lower muzzle velocity. Therefore, I probably can use LR primers in the .375, but not Magnum primers anywhere not recommended by the loading books.
Milspec CCI primers are nothing more than Small rifle magnums, large rifle magnums, and small pistol magnums. They use them in 5.56, 9mm, and .308.
I personally find lower extreme spreads and better consistency with Magnum primers where you’d normally use an std primer.
cci 34 primers
You experienced lower velocity because you are lighting up 100 grains of powder or more. The std primer doesn’t catch as much of the powder charge afire as quickly therefore pressures mount slower. Some cartridges you absolutely have to use a magnum primer in if you want consistent performance. But you can safely use magnums in any cartridge so long as you use the proper type. (I.e. you shouldn’t go putting small rifle magnums in a small pistol like a 9mm, it’ll fit and might even work, but the harder primer cup intended for the stronger firing pin of a rifle may not fire at all in a handgun)
Magnum primers are an average of 6% hotter than standard primers. So as long as you follow the common sense reloading practices like reducing max by 10% and work up you will be just fine. and I’d bet money you’ll find the very same results I did