Fired Brass Can't be Re-Sized

Definitely sounds like an oversized chamber and should be replaced by the manufacturer. I bet it will be replaced and quick. Customer service is king. I can only think any builder would cringe at having shipped something out of spec. It can happen and they should have their chance to make it right without a public flogging. That being said why be willing to immediately go with a compromised, work around, semi-solution?
 
rsbhunter said:
I agree with the chamber casting solution. That will answer all the questions...if it is to spec, then the builder/manufacturer is out of the equation, for the most part. If it is out of spec (oversized) then the seller should be held accountable. Give them a chance to make it right at their expense, if they don't, then there are other avenues to encourage them to do the right thing. Have a cast made by a gunsmith, this removes the doubt that "you didn't do it correctly". Not that it is faulty, but take one step at a time, and it will be resolved.rsbhunter
Click to expand...
This is a relatively new gun. OP should not have to spend money on it to prove what the defect is. The gun is spitting out way over size brass, whether it is hand loads or shooting factory ammo. My books, they don't work right, they go back to the manufacturer and get them to fix it. I would send the gun and 3 or 4 casings from a factory load. They have all the gear and expertise to evaluate the problem so why should he need to spend money on a separate gunsmith. Far too may guys spend a ton trying to figure out what is wrong with a gun when it is the manufacturers issue to deal with. I think the OP is being very fair to the maker in not disclosing who they are till he has a chance to deal with them. At this stage, that seems like the proper next step, all this other speculation and suggestions aren't really going to change that.
 
Dean2 said:
This is a relatively new gun. OP should not have to spend money on it to prove what the defect is. The gun is spitting out way over size brass, whether it is hand loads or shooting factory ammo. My books, they don't work right, they go back to the manufacturer and get them to fix it. I would send the gun and 3 or 4 casings from a factory load. They have all the gear and expertise to evaluate the problem so why should he need to spend money on a separate gunsmith. Far too may guys spend a ton trying to figure out what is wrong with a gun when it is the manufacturers issue to deal with. I think the OP is being very fair to the maker in not disclosing who they are till he has a chance to deal with them. At this stage, that seems like the proper next step, all this other speculation and suggestions aren't really going to change that.
Click to expand...
Well said.

It is a brand new gun.
 
I agree with MikeCR, those fired cases are a pretty good indicator of an oversize chamber. A chamber casting might give better resolution of exactly how oversized it is, but that it is clearly oversize is firmly established. I think Dean's suggestion of several fired cases being sent with the rifle is a good one, even if the mfg wants to fire their own ammo in the rifle. Assuming that the mfg does consider this to be a problem...

Assuming that the mfg won't do anything about it, are you willing to spend more money to get a good barrel in the rifle? Sounds like you might be familiar with some good barrel options.

Concur that an adjustable GB is the way to go with different loads. I put a Superlative on a .308 and couldn't be happier with how it works.
 
ntsqd said:
I agree with MikeCR, those fired cases are a pretty good indicator of an oversize chamber. A chamber casting might give better resolution of exactly how oversized it is, but that it is clearly oversize is firmly established. I think Dean's suggestion of several fired cases being sent with the rifle is a good one, even if the mfg wants to fire their own ammo in the rifle. Assuming that the mfg does consider this to be a problem...

Assuming that the mfg won't do anything about it, are you willing to spend more money to get a good barrel in the rifle? Sounds like you might be familiar with some good barrel options.

Concur that an adjustable GB is the way to go with different loads. I put a Superlative on a .308 and couldn't be happier with how it works.
Click to expand...
All good points and suggestions. Thanks.

It is a high dollar gun. I don't know if I am willing to spend more or not. I should not have to.

Still on hold. Going on an hour now.
 
Is there a possibility your bolt is opening earlier than normal?

Posting a picture or two of the fired cases in profile could help folks trouble shoot

If, so, someone who is familiar with the AR10 gas system might be able to help or give advice.
 
side issue
dont mean to hijack your thread

monday morning & out of work
so I have a little time on my hands

I been reloading and competing for 15 years

I thought I'd share some of my experiences with my "AR-10's"

I have 2 Armalite AR-10s in 308 both 20"
both are very rough on brass
1 home built Aero Precision AR-10 chambered in 6.5cm 24" also rough on brass
1 DS Arms metric FAL 16" brass is fine

All 3 guns when new would not run right
none of them and very $ frustrating $

they were all "too tight"
meaning mags and springs

the solution I found on the internet was to load the mags full and let them sit for a few weeks
this helped

along the same lines, noodled this out myself
I kept each rifle's return spring locked back for a similar period of time
this was the final piece

the FAL took the most number of breakin rounds
and had one bad factory mag

now I can heat up those barrels really well

I also run new guns wet with oil for breakin
everything wet
every moving part
sloppy wet

is it possible you have a sticky bolt face?
delayed bolt face?
causing overpressure?

compare your AR10 bolt/carrier movement to a AR15
sticky/slick/loose?

good luck
enjoy the journey
 
If you believe you have an off center chamber that should be easy to prove. Are the fired cases oblong when you run them in your concentric gauge?
 
Well, after over one hour on hold with the manufacturer, I gave up. I will try later.
 
Did you anneal the cases before resizing?You might have to anneal before resizing every time.With an adjustable gas block you can time your action so it does not eject the case before it is ready.The case can grab the chamber and stretch.So your cases are getting work hardened.Just a thought,Huntz
 

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