Primers You Should Not Use With Specific Loads

[Mark_Mark]

My wife and i have JA 22'S. We each have them bedside. They have been fine for a Saturday night specials. We do shoot them too now and then.

Fun little Jam-O-matic! Funny thing was, I sold it (after factory) for what I paid for it

 

[MFInc]

I was ignorant when I used Rem 1 1/2 primers for my .40 S&W loads. Several thousand rounds that I shouldn't have loaded...without issue or incident. I'm down to 9 sleeves of Rem 1 1/2 now, so having seen the warnings now I'll use them for other calibers.

I bought some of those last year expecting to load 40 S+W, Then I read that article posted here. I Only use the Rem 1 1/2's on my 9mm loads with CFE-P, which were mostly mid range loads.. Down to 2 sleeves now

 

[Random 8]

Slam firing a M1 sounds scary

Yes, it gets your attention. They are not meant to be a BAR. Fortunately I was way out in the woods with several miles of safe backstop. Pretty sure the second round would have been over the berm at my range.

 

[Jeremy2171]

#34 for M1 Garand.

Not required or needed

 

[Shivahasagun]

Fun little Jam-O-matic! Funny thing was, I sold it (after factory) for what I paid for it

A family member bought two JA22's new for $60 each decades ago.

Tried cheap and quality ammo and cleaned and lubed but neither worked well. One would often wait until round 6 to jam but the other never cycled more than 2 in a row. Junk.

I dont remember how he disposed of them.

 

[Nature Boy]

Not using CCI 400s in a .223 load has a lot to do with the potential of them piercing.

Here’s my experience.

https://www.thehighroad.org/index.php?threads/blanked-my-first-primer.854168/

Here a good reference on the subject.

https://www.accurateshooter.com/technical-articles/primers-and-pressure-analysis/

 

[Edcnh]

I had never read about Not using CCI 400 primers in a 223. I have used them with no problems in my bolt action 223.

 

[Otto]

I was ignorant when I used Rem 1 1/2 primers for my .40 S&W loads. Several thousand rounds that I shouldn't have loaded...without issue or incident. I'm down to 9 sleeves of Rem 1 1/2 now, so having seen the warnings now I'll use them for other calibers.

So it's fine to use 1 ½ primers for 9mm but not 40 S&W? Why? Both cartridges have a maximum pressure of 35,000 psi.
Anyway, I doubt that you'll ever see Remington primers again for sale. They will become a collectors item.

 

[CoalCrackerAl]

Our JA'S like remington golden bullets.

 

[KentM]

I posed the question as to whether the CCI BR4 primers are suitable for semi-autos like AR-15s, or do they have the same soft cup as the #400s. fxvr5 gave me a link to contact CCI with the question, which I did. Here is their response:

CCI BR4s would be your best choice right behind the 41s as they have a thick cup that helps reduce the possibility of slam fires. With that being said all 3 have been known to work with with the risk being slightly higher for slam fires on the CCI 400s if your firearm is known for leaving a bird peck. Cody B., Technical Service Help. [emphasis added]

 

[Otto]

I would not use 400's in a AR. The cups are too thin. The rest are fine but my preference would be the 450 Mag which is the same as the BR4 without the benchrest marketing hype and extra cost.


400
For most standard loads in cases requiring small rifle primers.

450 Mag†
Magnum primer for ball propellants.

No.41/5.56MM
Military small rifle primer with NATO sensitivity. (resists slam fires)

BR4
Benchrest small rifle primer for critical accuracy needs.

 

[GeoDudeFlorida]

I would not use 400's in a AR. The cups are too thin. The rest are fine but my preference would be the 450 Mag which is the same as the BR4 without the benchrest marketing hype and extra cost.


400
For most standard loads in cases requiring small rifle primers.

450 Mag†
Magnum primer for ball propellants.

No.41/5.56MM
Military small rifle primer with NATO sensitivity. (resists slam fires)

BR4
Benchrest small rifle primer for critical accuracy needs.

I think you put your finger on the point of confusion, here: no one is saying all .223/5.56mm should be reloaded only with NATO spec' No.41 primers or magnum small rifle primers, they're saying IF your semi-auto rifle leaves indents on the primer when loaded from the magazine, it is safest to use a harder primer than the standard small rifle to avoid the possibility of a slamfire. Bolt action, top-break single-shot, pump action and other should not worry about using a harder primer, they should get their guns fixed if they leave a "peck" on the primer just from closing the action and are concerned about an AD.

 

[GeoDudeFlorida]

Not required or needed

Topic title: "Primers You Should Not Use With Specific Loads"
My response: "#34 for M1 Garand."
Your response: "Not required or needed"

Glad you agree with my first post.

I do use #34's with some of my Garand loads because they seem to work a little better with the 168gr. BTHP-MK bullets and IMR 4064 powder. Shoots way better than me. For plain-Jane mixed headstamp plinking loads, IMR 4895 and standard large rifle primers with 150gr. FMJ is fine.