Primer Test CCI 250 vs CCI 34

[Larryh128]

I have read that the CCI 250 and #34 were identical heat range, just a slight difference in the anvil to lessen the possibility of slam fires. I have used #34 for years and have 250's gathering dust so I decided it was time for a test. I loaded equal amounts of the same load, powder /bullet with 1 group with #34 and the other with 250's. Also playing with a new scale so it was a good time to check both at the same time. I could tell absolutely no difference between the 2 primers. Both had exactly the same fps range, 2984-2989. So I'm happy about the primers and also quite impressed with the scale. Only shot 100 yds but every group was a single enlarged hole. Pretty happy camper.

 

[L.Sherm]

Nice !! Testing is the way to find out, now stretch the legs out on the barrel and that will tell you more

 

[Larryh128]

It's a hunting rifle but it is very accurate to 500 yds. I can do a comparison at 500, only issue that I've had lately is insane mirage during a very dry season. I will be testing at 500 to double check my data that I inputted to the scope. Veracity PH.

 

[RegionRat]

If a primer is sold to a contract that requires the Mil-Spec for #34 for example, that means it specifically gets the MIL testing.

To keep this post short, those specs evolved to support the GOV weapon systems so they have a few major concepts for example, the threshold where they will not be set off by accident, and the threshold where all of them must go off.

Commercial designs may or may not include these tests. Those commercial specifications and designs are proprietary to each manufacturer and plant. That said, it is not hard to imagine a version that could be otherwise identical, but without the rigor of all the batch controls and testing that is commercial versus MIL. YMMV

 

[Acyr]

I found the same results with CCI 41 vs 450.

 

[RegionRat]

I found the same results with CCI 41 vs 450.

And... not for your sake but for the rookies... always make sure you are taking care of your ignition maintenance and the 450 will do the job.

The CCI 41 is an anti-slam fire cup, so it follows that we have to make sure the pin strike is not anemic with all the heavy-duty primer cups.

 

[Larryh128]

I tested 300 & 400 today, same results as previously and it appears that my dope in the scope is good.

 

[Acyr]

And... not for your sake but for the rookies... always make sure you are taking care of your ignition maintenance and the 450 will do the job.

The CCI 41 is an anti-slam fire cup, so it follows that we have to make sure the pin strike is not anemic with all the heavy-duty primer cups.

Correct me if I am wrong. From what I remember reading somewhere, the difference between them is the design of the anvil not the cup.

 

[RegionRat]

Correct me if I am wrong. From what I remember reading somewhere, the difference between them is the design of the anvil not the cup.

Forgive me if I cannot answer directly.
I can however, point out the following.

https://www.sksboards.com/smf/index.php?topic=56422.0

 

[BoydAllen]

Forgive me if I cannot answer directly.
I can however, point out the following.

https://www.sksboards.com/smf/index.php?topic=56422.0

Wow! That is the most information about primers that I have ever seen. I recommend that everyone click on the link and save it. Thanks.

 

[divingin]

Great info; Thanks!
Will take a bit to go through and digest it all.

 

[Scalloper]

Forgive me if I cannot answer directly.
I can however, point out the following.

https://www.sksboards.com/smf/index.php?topic=56422.0

Great article and one that I have been needing for awhile. I have an AR I use for coyote hunting and slam fires are common.

 

[boltfluter]

Great article and one that I have been needing for awhile. I have an AR I use for coyote hunting and slam fires are common.

That makes for some exciting hunting trips! Not. Lol.
Paul

 

[6.5 forever]

Great article and one that I have been needing for awhile. I have an AR I use for coyote hunting and slam fires are common.

Does common mean it doesn't scare you anymore? Lol

 

[charlie b]

Read a version of that a few yeats ago during covid. Served me well since I had just switched to SR primed brass. I didn't have a large stash so got what was available, which was mostly CCI SPM primers.

They gave me good performance and just a little less vel than the Rem 7 1/2 primers. IIRC about 25fps less on avg.