Large Rifle Primers vs. CCI 34


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Win1892
March 29, 2010, 07:29 PM
Anybody see a reason not to use #34 CCI primers in place of Large Rifle?

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JimKirk
March 29, 2010, 07:58 PM
They will work in most guns without any problems. If your gun has a weak firing pin spring or some other reason that would cause a lighter strike, then you may have problems but otherwise they will work.

Jimmy K

ArchAngelCD
March 30, 2010, 05:24 AM
I agree, if you rifle is in good operating condition I see no reason not to use the CCI #34 primers.

Peter M. Eick
April 2, 2010, 10:57 PM
The c-34 is a MAGNUM primer. Adjust accordingly.

SlamFire1
April 2, 2010, 11:06 PM
Not as magnum as WLR. CCI#34s are excellent primers. I have won, placed, or received awards points using the CCI#34 in my match rifles. Won an XTC match last week with them.

Firearms with weak ignition systems, worn out mainsprings, insufficient firing pin strike or protrusion, may experience problems with mil spec primers.


M98 26" 1-10 Wilson Barrel


168 gr Sierra Match 47.0 AA2495 wtd R-P cases CCI 34 OAL 3.30" 5 May 00
T=82F

Ave Vel = 2720
Std Dev = 4
ES = 12
Low = 2713
High = 2725
N = 10


168 gr Sierra Match 47.5 AA2495 wtd R-P cases CCI 34 OAL 3.30" 5 May 00
T=82F

Ave Vel = 2745
Std Dev = 9
ES = 28
Low = 2728
High = 2756
N = 10

168 gr Sierra Match 47.0 AA2495 wtd F-C cases WLR OAL 3.30" 5 May 00
T=82F

Ave Vel = 2765
Std Dev = 10
ES = 30
Low = 2745
High = 2775
N = 11

Peter M. Eick
April 2, 2010, 11:11 PM
Agreed. It is not a "hot" magnum but you still have to act accordingly.

I shoot a lot of c-34's out of my M1A's and always found them accurate with IMR-4895 and 168 Sierra's.

MRH
April 5, 2010, 05:11 PM
They are much harder than standard LR primers, and as such

As noted by SlamFire:
Firearms with weak ignition systems, worn out mainsprings, insufficient firing pin strike or protrusion, may experience problems with mil spec primers.

However, the only way I can keep my SKS from slam fires is to use the #34s.

As with any component change, work up the load.

frankge
April 6, 2010, 10:36 AM
I was looking for 34's due to reports of slam fire conditions in military rifles. I reloaded with Winchester LR for my 7.62x39 in my AK and never got a single slam fire. I still wanted to use 34's but could not find any avaialble. I ordered 5000 Wolf LRs because it was reported that they were a little "harder" than standard US made primers. But that was internet research so I take it with a grain of salt.

aka108
April 6, 2010, 12:40 PM
The 34 were most likely made for use with the SKS's and AK's or other arms with the free floating firing pins. Harder to help prevent slam fires.

cheygriz
April 6, 2010, 02:33 PM
The #34 is their MilSpec primer.

Remington 7 1/2 SM and 9 1/2 LR are also MilSpec, and available "off the shelf."

ScratchnDent
April 6, 2010, 03:26 PM
Remington 7 1/2 SM and 9 1/2 LR are also MilSpec, and available "off the shelf."

Wow, really?

It bums me out to hear that I've been paying more for #34s and having them shipped to me when I had 9 1/2s already sitting on my bench!

cheygriz
April 6, 2010, 04:12 PM
When I got my first SKS, I was having 2-3 slamfires with every magazine of reloads, and factory PMC "sporting" ammo. (The only 7.62X39 available at that time)

I wrote to the NRA, and they told me that the Remingtons were Milspec. I switched to Remingtons, and haven't had a poroblem since. That was more than 25 years ago.

I've used nothing but Remington primers for the last 25+ years.

P-32
April 7, 2010, 05:33 AM
The 34 were most likely made for use with the SKS's and AK's or other arms with the free floating firing pins. Harder to help prevent slam fires.

Just so you know, the M-1, M-14 and M-16 and their clones all have free floating firing pins. I understand the 34's have a different anvil angle than the "regular" primers.

SlamFire1
April 7, 2010, 12:09 PM
I understand the 34's have a different anvil angle than the "regular" primers.

They might have a different primer composition.

The CCI#41's have a thicker cup than WSR. I stopped using the brass colored WSR due to all the firing pins that got dished when they pierced. Same loads don't bother a CCI primer at all.

cheygriz
April 7, 2010, 05:34 PM
And they won't bother the thicker cup of a Remington.

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