Semi auto primer selection

Big bore dinosaur

Big bore dinosaur

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308 Winchester in a semi auto platform.
Would you need to use CCI 34 large rifle primers? Thicker mantel primers are harder , less likey to slam fire.

Are there other large rifle primers that are not so soft. Cci br2? Remington?.

Dont have any CCI 34 on hand .
Advise from the gunnies plz.
 
Gatehouse said:
Avoid regular Federal primers. They are soft and given an opportunity they will slamfire or fire out of battery.
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Like so many people, you do not understand what "out of battery means". A slam fire will, pretty much by definition, not occur out of battery. Most, if not all modern rifles are designed so that an out of battery is virtually impossible.

"Out of battery" means the bolt has not locked forward. In the event of an OOB explosion, the rifle will explode in your face and you WILL incur injury and probably serious injury because the bolt will come flying backwards out of control and the case will rupture and blow 60,000 psi of burning gas and brass fragments into your face. Rifles like the AR15 cannot OOB because the firing pin cannot protrude from the bolt face until the bolt has locked forward.

A slam fire, is an uncontrolled firing that occurs when the bolt is in battery and the firing pin continues forward under its own momentum and has enough energy to initiate the primer. There is no danger involved in an slam fire because the bolt is locked forward and so the rifle functions / recoils just as it is designed to, only without the trigger being pulled.
 
I Dont Care About You said:
Like so many people, you do not understand what "out of battery means". A slam fire will, pretty much by definition, not occur out of battery. Most, if not all modern rifles are designed so that an out of battery is virtually impossible.

"Out of battery" means the bolt has not locked forward. In the event of an OOB explosion, the rifle will explode in your face and you WILL incur injury and probably serious injury because the bolt will come flying backwards out of control and the case will rupture and blow 60,000 psi of burning gas and brass fragments into your face. Rifles like the AR15 cannot OOB because the firing pin cannot protrude from the bolt face until the bolt has locked forward.

A slam fire, is an uncontrolled firing that occurs when the bolt is in battery and the firing pin continues forward under its own momentum and has enough energy to initiate the primer. There is no danger involved in an slam fire because the bolt is locked forward and so the rifle functions / recoils just as it is designed to, only without the trigger being pulled.
Click to expand...

You sound really unintelligent, assuming that only you know and understand the great mystery that is the difference between slamfire and out of battery.And you managed to exaggerate it, too.

Out of battery the rifle may not explode at all, because the rifle action itself is really strong and designed to contain high pressure and with an OOB it isn't actually containing much of the pressure. The rifle action may incur damage but "explode in your face" is often rifle dependent. Do you know what a Garand, M14 or SKS rifle action look like after having an OOB? About the same as before. The bolt and it's parts will look much different though. So will the brass.

The case will usually rupture or deform in some way. Chunks of brass ranging in size from shavings to small bits will usually get thrown about. The bolt and the parts attached will likely get damaged and also get thrown about . And you will be happy you remembered to put your safety glasses on that day.

I'm pretty sure I know what firing out of battery means. I mean, I've seen it happen on several occasions and I've had it happen to me with a Garand. Somewhere I probably still have the brass, which looks like a 30-06 case with no neck, just slight sloping shoulders into the case mouth.

Now please share with us your personal experiences with out of battery discharge, since you seem to know so much more than anyone else, you must have witnessed this in person
 
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Which semi-auto rifle?

The Federal primers uses a different, more sensitive compound and should be avoided. I have had them detonate in my hand primer.

The M-14 has some unsupported case near the head and should be used with tall web brass (like LC or IVI).
 
You don't need special brass for an M-14. That is pretty silly. All LR primers are .027" thick so it will be a matter of hardness. I have never had issues myself using Winchester, CCI, Remington or Murom. I have lots of 215m, I guess when I get to them I will keep the ammo out of any M-14 type rifles that may be around.
 
What about browning bar, I have a 30-06 and I use CCI primers I believe(need to double check that)? Checked, federal magnum primer for the bar!! So far no problems!
 
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Over the yrs I've shot thousands of Winchester primers in Garands and M14s..never had a problem.

I do clean the primer pocket, seat the primer well below flush and ensure I have a clean chamber and well sized brass.

Oh and alway feed from the magazine.

Never hand place a cartridge into the chamber and then release the bolt to slam into it.

Hope that makes sense.
 
If your rifle has a floating firing pin like an SKS then use the #34 primers
I remember reading that they were recommended for the AG42 as well
Rifles with spring loaded firing pins should not need them
 
B said:
You don't need special brass for an M-14. That is pretty silly. All LR primers are .027" thick so it will be a matter of hardness. I have never had issues myself using Winchester, CCI, Remington or Murom. I have lots of 215m, I guess when I get to them I will keep the ammo out of any M-14 type rifles that may be around.
Click to expand...
The M14 chamber may have a groove at the bottom where the round feed up from the mag. If this groove enter the chamber mouth, the case head is unsupported there. Not a problem with military brass - it usually has a taller web.

I did a quick Google search on this, because I recall some blown M14s in competition where guys were using commercial brass. I found:

FWIW, the bolt of an M1A begins to unlock before the bullet leaves the muzzle (standard twenty inch barrel length) subjecting the fired cartridge case to full chamber pressure while the rear of the case becomes unsupported by the fully locked bolt.
 
Gatehouse said:
You sound really unintelligent, assuming that only you know and understand the great mystery that is the difference between slamfire and out of battery.And you managed to exaggerate it, too.

Out of battery the rifle may not explode at all, because the rifle action itself is really strong and designed to contain high pressure and with an OOB it isn't actually containing much of the pressure. The rifle action may incur damage but "explode in your face" is often rifle dependent. Do you know what a Garand, M14 or SKS rifle action look like after having an OOB? About the same as before. The bolt and it's parts will look much different though. So will the brass.

The case will usually rupture or deform in some way. Chunks of brass ranging in size from shavings to small bits will usually get thrown about. The bolt and the parts attached will likely get damaged and also get thrown about . And you will be happy you remembered to put your safety glasses on that day.

I'm pretty sure I know what firing out of battery means. I mean, I've seen it happen on several occasions and I've had it happen to me with a Garand. Somewhere I probably still have the brass, which looks like a 30-06 case with no neck, just slight sloping shoulders into the case mouth.

Now please share with us your personal experiences with out of battery discharge, since you seem to know so much more than anyone else, you must have witnessed this in person
Click to expand...
I had an OOB ,firing pin cracked off , kaboom!!! Lol
Blew the mag to ####, a few black scorches on my trigger finger. That’s about it..

Well I was confused for a couple of seconds 😂
 

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I've loaded tens on tens of thousands of rounds for ARs - both .223/5.56 and 7.62 with 205m and 210m (Federal match) primers that are arguably the softest primers out there with zero issue.
I am vigilant with ensuring proper seating depth however.
 
Ganderite said:
The M14 chamber may have a groove at the bottom where the round feed up from the mag. If this groove enter the chamber mouth, the case head is unsupported there. Not a problem with military brass - it usually has a taller web.

I did a quick Google search on this, because I recall some blown M14s in competition where guys were using commercial brass. I found:

FWIW, the bolt of an M1A begins to unlock before the bullet leaves the muzzle (standard twenty inch barrel length) subjecting the fired cartridge case to full chamber pressure while the rear of the case becomes unsupported by the fully locked bolt.
Click to expand...
That absolutely miniscule cutout has no bearing on what sort of brass you need. I am not gonna argue with you here. If you really think that matters I would say you are basing it off no actual experience.

Standard barrel length is 22" so the whole bolded is incorrect. Bullet is long gone before anything unsafe begins to happen.
 
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Ganderite said:
Which semi-auto rifle?

The Federal primers uses a different, more sensitive compound and should be avoided. I have had them detonate in my hand primer.

The M-14 has some unsupported case near the head and should be used with tall web brass (like LC or IVI).
Click to expand...
308 grizzly, test her out when the law permits IT.. intersting about federal primers
 
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