Rounds wont fire.

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I have .223 and 5.56 reloads for my AR. They are properly sized and length is within specs. I just purchased a new juggernaut tacticle AR and the reloads dont work in the gun they just get jamme. The rounds however shoot fine out of my anderson AR 15 and my friends ruger AR. Any thoughts or ideas? Going to take it apart and clean it and lube it well. My friend has the same issue with his juggernaut. We got them same time.

Forgot to mention as well that new 5.56 rounds worked perfectly fine in both guns
 
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If the issue is happening in both Juggernaut ARs but not others, my first thought is quality control at the manufacturer. Possibly weak hammer springs in both or the firing pin is too short. What do the primers look like in the rounds fired in the Juggernaut ARs? You are looking for light strike primer hits or something abnormal.
 
There is no strike on the primes. After attempting to fire as well the bolt gets stuck and a concuterable amount of force is required to release it and eject the round.
 
I attempted this with 10 rounds with the same outcome each time. Then took those same 10 rounds in the same mag and they worked perfectly fine in the other ARs. (Did 10 each Juggernaut with the same results)

Forgot to mention that new 5.56 rounds worked in both juggernaut's with no issues
 
After attempting to fire as well the bolt gets stuck and a concuterable amount of force is required to release it and eject the round.

Does this happen with both of the Juggernaut ARs? It sounds like the problem is not limited to a short firing pin or a weak spring. One thing you can attempt is take the bolt carrier group from the Anderson or Ruger AR and do a test fire in one of the Juggernauts. If it fires, you know the issue is somewhere in the Juggernaut bolt carrier. Assuming all the ARs in the scenario are the same cartridge.

Do these Juggernauts also malfunction with factory ammunition as well?
 
I will definitely attempt seeing how they function with the bolt from the other 2 but they are both acting in the same manner however they do fire as intended with factory ammo.
 
If the rounds are really hard to eject, the bullets might be getting jammed in the rifling. Are there rifling marks on the ejected unfired rounds.

Was there any marks on the primers at all?

did those 10 rounds fire from another ar?
 
They are properly sized and length is within specs.

Are you using a cartridge case headspace to determine if the cases are "properly sized"?

ODsYmCL.jpg

or are you just screwing the die down to the shell holder and adding a quarter turn?

I always recommend the use of small base dies for semi autos, but lets say that your cases are 1) too fat (regular sizing die) and 2) too long. That is too long between base and shoulder. Given 1 or 2, or, 1 and 2, the bolt is probably not closing in your rifle because your cases are too fat, or too long, or both!

Your chamber has to be slightly different than your buddies, and without gauges, you don't know where the difference is.
 
There is no strike on the primes. After attempting to fire as well the bolt gets stuck....
Insufficient headspace (dimension)* for that chamber on the reloaded rounds,
...therefore....
The bolt is not fully closing,
...therefore....
The bolt has not rotated sufficiently for the firing pin to protrude from bolt face upon hammer fall,
...therefore...
The pin does not strike the primer (thank God),
...and,,,
The (*insufficiently-sized) case has become firmly stuck in chamber when the bolt closed on it with some considerable force.


.
 
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A Sheridan case gauge will let you know if you are under or over sizing the rounds as far as the shoulder goes, as does the Wilson, but also checks diameter, so it is the better choice. That said, many or most guns will function with ammo that passes the Wilson. Rainy day ammo absolutely gets checked with the Sheridan.
Wilson & Sheridan .223 Case Gauges.jpg
 
If the rounds are really hard to eject, the bullets might be getting jammed in the rifling. Are there rifling marks on the ejected unfired rounds.

Was there any marks on the primers at all?

did those 10 rounds fire from another ar?


There were no markings that I noticed and those 10 rounds fit shoot perfectly out of both ARs that jammed in both 5he juggernauts.
 
The other two ARs have loos(er) chambers.
The Juggernaut has a tight chamber (but not so tight that it won't fire commercial ammunition)

You have a resizing problem.
- What press are you using?
- What dies are you using?
- Whose cases are you using (the commercial cases that fired in the Juggernaut... or another rifle?)
- How are you adjusting the resizing die?
 
A Sheridan case gauge will let you know if you are under or over sizing the rounds as far as the shoulder goes, as does the Wilson, but also checks diameter, so it is the better choice. That said, many or most guns will function with ammo that passes the Wilson. Rainy day ammo absolutely gets checked with the Sheridan.
View attachment 903844

Till now I've used a digital caliper to determine the length of my bullets prior to loading and about every 20-40 rounds loaded for quality but I will give this a try seeing as how it seems to be a different situation with my new AR
 
I went through the same thing, I hate the .223/5.56. Had a bolt rifle that was .223 and never had a problem with any cartridges I reloaded. This all changed when I added an Armalite to the mix. The rounds would not enter the chamber of the AR and using the Forward Assist didn't help either. It wasn't the base causing the problem it's the shoulder. The only thing I can tell you is get a magic marker and color the whole cartridge, then try to load it in the gun where it jams. You'll see what's causing the problem.
 
The other two ARs have loos(er) chambers.
The Juggernaut has a tight chamber (but not so tight that it won't fire commercial ammunition)

You have a resizing problem.
- What press are you using?
- What dies are you using?
- Whose cases are you using (the commercial cases that fired in the Juggernaut... or another rifle?)
- How are you adjusting the resizing die?

I'm using the hornady AP press with the custom grade dies and I am using all the dies as reccomend by hornady.
I'm using winchester new brass and once fired mixed headstamp but primarily federal.
 
There were no markings that I noticed and those 10 rounds fit shoot perfectly out of both ARs that jammed in both 5he juggernauts.

Are you sure that the bolt was closing all the way on the rounds that failed to fire? Since there were no marks on the bullets or the primers, the rounds fired in other rifles and they were handloads, my guess is that you did't size the brass enough to fit into the chamber of the new rifle. It sounds like the new rifles have really tight chambers. Did you use a case gauge on the rounds that failed to fire?

They are probably firing out of the older rifles because those were the last rifles the brass was shot from and the brass formed to those chambers. When you sized them, you probably just sized them enough to properly feed into the older rifles. Case gauges ensure that ammo is within spec, not just suitable for one firearm.

I'm guessing that you didn't have any marks on the primers because the firing pin didn't even get close to hitting the primers. Odds are that the reloads weren't chambering all the way and you were dropping the hammer on an out of battery bolt, preventing the hammer from hitting the firing pin. I'm guessing at all of this, but just the act of chambering a round by dropping the bolt on it should leave some sort of firing pin dent in the primer. This is because the firing pin is not spring loaded. It is free floated and the inertia of the bolt slamming home usually allows the pin to hit the primer with enough force to leave a little mark. Like a light primer strike.

The lack of any mark at all tells me that the pin didn't hit it.
 
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I've heard of simular issues with bolt action rifles. Same caliber of 2 different rifles but one won't chamber enough to close the bolt.
It was tighter specs on that one rifle.
Same factory ammo worked in both.
Their remedy was to adjust the tighter chamber to be similar to the other.
Don't know if that's the way to go and am not suggesting it. It's just what they did so both rifles would take same reloads.
 
I went through the same thing, I hate the .223/5.56. Had a bolt rifle that was .223 and never had a problem with any cartridges I reloaded. This all changed when I added an Armalite to the mix. The rounds would not enter the chamber of the AR and using the Forward Assist didn't help either. It wasn't the base causing the problem it's the shoulder. The only thing I can tell you is get a magic marker and color the whole cartridge, then try to load it in the gun where it jams. You'll see what's causing the problem.

If I find the location on the shoulder what would the next step be?
 
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