View Full Version : CCI #34 primer question.
May 02, 2007, 15:26
Here is my current load for my Fal:
Brass – Once fired LC military.
Bullet – Pulled 147gr FMJ.
Powder – 45gr WCC846 Pat’s
Primer – CCI large rifle, standard.
I’m switching over to the CCI #34 military primer. How much should I reduce my powder charge when using this primer?
May 02, 2007, 22:16
I shot the above load this morning and was just looking at the brass a little closer. The primers are a little flat. I thought this load was a tad warm and the primers seem to suggest that. I'm thinking of backing the powder off to 42grs with the #34 primers.
May 02, 2007, 22:36
My Varget 7.62x51 load is 2 grains less with the CCI #34 than with a Federal Match primer for about the same velocity (in like brass).
May 14, 2007, 18:34
The sierra loading manual number 4 says to consider CCI # 34 primers to be MAGNUM primers.
so you should reduce your load 10% PLUS and work back up.
May 14, 2007, 20:31
I shoot 45.5grs WC-846 Federal brass which has the least volume, a 150gr Nosler BT and a CCI-250, my Savage makes caliber sized holes at 100yds with that load. Sounds like you guy's load very light loads, the loading data says use 46grs, and this powder is bulk win 748, some mauals show a max of 48grs with a 150.
May 15, 2007, 11:27
I've noted a lot of "flat" primers with no other indications of overpressure. I may be wrong, but I look for "cratered" primers. It takes a magnifying glass for me these days, but until I see that, I rarely get excited. Flat primers, ALONG WITH unusually vigorous action cycling, sharper than normal muzzle blast (as compared to a factory shelf load) will prompt me to reduce charge a few grains.
FWIW, I run 42 grs. of IMR (or Hodgon) 4895 under 147 FMJ pulls, WLR primers. I DO have a few thousand CCI primers, but have not started on them yet. I quit them years ago when they failed on me while loading competition handgun silhouette loads. I got a deal on a bunch, so I stuffed my fears. Lol.
My load runs all my FALS on gas # 3 or # 4 (forget which). Comfortable yet robust. I post as accurate a group with it as I expect from a battle rifle operated by someone with "almost 50" eyesight.
May 16, 2007, 22:48
I have yet to test my new load. I went from 45grs of WCC846 with standard CCI primers; to 41.5 grs with #34's. I'll see how this does.
September 20, 2007, 14:29
Bump. Just picked up some CCI 34's. How did your test come out? I have been loading about 40.5 of IMR 4895 with WLR's. Should I back this off with the #34's?
September 20, 2007, 21:58
I'm using 44 gr of 846 under a 147 FMJ in mine with CCI 34's. Pretty happy with this load, but 846 does vary from lot to lot so any load should be worked up. Personally I think a chronograph is mandatory for working up loads with milsurp powder.
September 23, 2007, 07:58
Went and test fired about 30 rounds. 150 gr pulled FMJ, 40.5-41 gr IMR 4895, and CCI #34s. Functioned perfectly through a DSA STG58 with the gas on 4.5. Plus shot a 2" 3 shot group at 100 yards, which is real good for me at this stage of the game! :fal:
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