greyling22
Member
I use a cci small rifle primer. I also use a tula small rifle primer.
have been shooting this carbine for about 35 years
I have never seen any "yet"
BTW: this is my home defense weapon--it gets test fired quite a bit
On a side note, regarding the post by Slamfire. When it comes to priming issues or slamfire issues (as in actual slamfires) I enjoy his post. Slamfire takes the time to add supporting material to his post. He defines why he post what he post and that counts
The real story is that Boxer primers leave the factory with the anvil higher than it would be when seated in a cartridge case. Seating so anvil legs touch the bottom of the pocket lets the anvil tip penetrate into the pellet of mix. The nearly universal recommendation of having the primer cup bottom 0.003 to 0.005 inch below flush with the case head exists to set the proper amount of priming mix between the cup and the anvil tip.
This critical distance is known as the bridge thickness. Establishing the optimum thickness through proper seating means the primer meets sensitivity specifications but does not create chemical instability. However, failing to set the bridge thickness through proper seating depth is the number one cause of primer failures to fire. The bridge thickness is too great with a high primer, even one whose anvil legs touch the bottom of the pocket
It most certainly is. Comes up all the time.High primers are the most common cause of misfires! For proper ignition the anvil must be firmly seated and the primer cake pushed into the anvil
This is good for the range, butA slam fire will not bother me as I always keep my rifle pointed in a safe direction...
You are talking about HD here. In you home where is the "safe direction"? The situation in a HD scenario would be too fluid for me to depend on a "safe direction". Through what door or window is the threat entering? Are they already in the house? If so, what room are they in? What friendlies are in the house? Where are they? In your home when you've determined your "safe direction", are you really not concerned about an AD due to a slam fire? I would be. If I have to grab my weapon and let the bolt fly the last thing I want to be concerned about is an AD whatever the cause.Bedroom: M1 carbine
And at the risk of starting another controversy, I belief that S&B uses small rifle primers in their pistol ammunition, due to my experience with a DA-only pistol that would fire Winchester consistently, and S&B on the first strike usually, but often required a second or third strike. One reason NOT to use small rifle primer in a pistol since the cups appear to be thicker material.
...I'm still in the camp that any small rifle primer will work in a 30 carbine just fine if the headspace is good and the bolt has been maintained.
But I'm still in the camp that any small rifle primer will work in a 30 carbine just fine if the headspace is good and the bolt has been maintained.
These NATO mil spec primers didn't even come on the scene until the 90's which is after the M1 carbine was taken out of service. I believe they were developed for the higher pressure 5.56, at least that's what CCI would have you believe. I haven't seen anything in their info sheets that specifically says anything about the 30 Carbine. If they have I missed it.
The M1 carbine was used in 3 wars without mil spec primers.
The actions are robust and if properly maintained slam fires and FTF's should not happen. There is no reason to think that it was because of the type of primer used.
No one offers to the public a 30 Carbine primer.
For those that want the numbers the LC ammo none fire/all fire tolerance was 6-36 in/ozs. and the primer cup thickness was .019", about the same as a regular SRP (CCI 400, WSR, Rem 6 1/2). CCI#41 (developed for the 5.56) none fire/all fire spec is 12-60 in/ozs. and cup thickness for both 41 and 450 is .025". Two different rifles and two different cartridges.
At Frankford Arsenal, William C. Davis issues "First Memo Report on AR-15 Rifle Ammunition Systems: Investigation of Firing Pin Energy and Primer Sensitivity." The kinetic energy of the existing AR-15 firing pin is found to range from 4 to 14 inch-ounces when the bolt closes. While Frankford does not currently have equipment to determine the sensitivity limits of .223 primers, they have been told by Remington that it should be comparable to military .30 Carbine primers. Primers for military .30 Carbine cartridges have "None Fire/All Fire" tolerances of 6 to 36 inch-ounces. Davis recommends that the None Fire limit for .223 ammunition should exceed 15 inch-ounces.
Frankford personnel submit study to TCC regarding primer sensitivity level versus risk of slam-fires:
None Fire - All Fire limits Risk of Slam-Fire
16-64 in-oz 1 In 10 million
12-60 in-oz (Current sensitivity limit for 7.62mm NATO) 1 in 160
12-48 in-oz 1 in 6,400
14-56 in-oz 1 in 11,000
Maybe you can reconcile the difference between these references.