The empty brass is a once fired crass that I ordered from MidSouth Shooters Supply last week. The top loaded cartridge brass has never been fired. What has caused this ring (seam) at the beginning of the shoulder? I have never seen this before.

Any help is appreciated.





Thanks,

Robert

That looks like an incipient separation
The cause would likely be excessive headspace. Was the primer standing proud of the brass? If so, it would confirm the headspace call.

It seems to be more the fault of the chamber rather than the brass. Has the chamber been modified/ackleyrized?

quote:

Originally posted by wildboar:
It seems to be more the fault of the chamber rather than the brass. Has the chamber been modified/ackleyrized?

I'm on your side.....It appears to have been rechambered and the job wasn't totally cleaned up with the reworked chambering.

Appears to be a chamber or reloading die problem to me, whatever it is, i would exchange the whole batch for new brass.

I would resize the brass and shoot it. I can't see that the little groove would cause any problem and when you shoot it once in your gun it will be gone.

As others have said, it's a chamber problem and not incipient separation.

Just so I understand: Was the empty fired in your gun? What round is this?

The shoulder looks like crap on the empty, but with a belted magnum, it's really hard to push the shoulder back without messing with the shell holder and thus crushing the belt.

We had a customer who was told to keep grinding his shell holder down until his 7 STW chambered his reloads easily! He was convinced there was somthing wrong with the chambering, even though factory ammo chambered fine, as did his once fired brass. The ones that didn't seperate that is!

Was the brass resized when you got it?

Looks like a case that was fire formed in a chamber that had a different shoulder dimension, and as others stated, probably not a real clean chambering, or re-chambering job.
Wrong place for case seperation.

quote:

Originally posted by vapodog:

quote:

Originally posted by wildboar:
It seems to be more the fault of the chamber rather than the brass. Has the chamber been modified/ackleyrized?

I'm on your side.....It appears to have been rechambered and the job wasn't totally cleaned up with the reworked chambering.

Vapodog,

The empty brass was fired in my rifles chamber which created the ring/groove.....All of the fired cartridges from yesterday's session have the groove. The top loaded cartridge is unfired but has been full length resized prior to loading.

Robert

Its a defect. I have seen this one time before. If your rifle has never done this before it has to be the brass. I found brass at the range that looks just like yours. I scraped it. Send it back!!!

The fired case reflects your rifle's chamber. The fault is in the chamber, not in the case.

Can you tell us more about the gun? Is it new, new to you, something you've had work done to? If you've shot the gun many times before and never had this happened I'd be more inclined to think brass problem, but otherwise I'm with most of the other posters thinking this is a chamber problem.

Also, have you measured the necks? Just eyeballing it (on my computer monitor with bifocals!), the neck on the fired case almost looks longer???

LWD

This is a new rifle to me. It is a Montana Rifle Company action that was originally chambered in 358 Norma. One of the owners had it re-barreled and chambered to 264WM which is stamped on the barrel. I'm not sure when or how this chamber was cut. The brass that you see is once loaded new brass after my first range session on Sunday........I haven't measured the necks.

Bizarre Note: Every load fired in the rifle which included 26 rounds of 120gr TSX's/53-58gr of H4831SC and 120 NBT's/ 58-63gr of RL22 shot sub-MOA. Most loads were in the .7's with a few .4's thrown in for good measure.

Robert

Looks like a piss poor chambering job to me. I dunno if it can be cleaned up as is or whether you'd have to pull the barrel, trim off a thread or two or do a total rechamber job. probably a competent gunsmith can do a chamber cast to determine which option is best. I am assuming that factory ammo does the same thing.
Paul B.

It's the chamber, no doubt about that.

A friend of mine just experienced the same thing with a 25-06 Encore (factory) barrel.

I think you need to stop shooting this thing and get it and a few pieces of the fired brass to a gunsmith---preferably one with lots of experience rebarreling and building better quality rifles.

Where are you located? Someone here probably can point you to someone good in the area.

LWD

quote:

Originally posted by LWD:
I think you need to stop shooting this thing and get it and a few pieces of the fired brass to a gunsmith---preferably one with lots of experience rebarreling and building better quality rifles.

Where are you located? Someone here probably can point you to someone good in the area.

LWD

LWD,

I'm just North of Atlanta,GA. I have spoken to Mickey Coleman and will probably send the rifle to him this week.

Robert

This is what I'm told by Jeff at MRC...........

The "Old Gunsmith" used to use a pilot reamer and then a finish reamer. It is the current gunsmith's opinion that the pilot reamer was run into the barrel too far and then the finish reamer was used creating the ridge and the shoulder angle issue. I am sending the barreled action to Mickey Coleman for a set back and chamber...If the barrel didn't shoot so well I would have just changed it out.


Robert

Check to see if your barrel is tight to the action.

quote:

Originally posted by Bruz:
This is what I'm told by Jeff at MRC...........

The "Old Gunsmith" used to use a pilot reamer and then a finish reamer. It is the current gunsmith's opinion that the pilot reamer was run into the barrel too far and then the finish reamer was used creating the ridge and the shoulder angle issue. I am sending the barreled action to Mickey Coleman for a set back and chamber...If the barrel didn't shoot so well I would have just changed it out.


Robert

Flock dat, let MRC put a new barrel on it. His "smith" screwed up, fixing it for you (at no cost to you) is his problem.
IOW why should you be on the hook for $100 (or so) to repair a "factory" defect?

quote:

Originally posted by Tailgunner:

quote:

Originally posted by Bruz:
This is what I'm told by Jeff at MRC...........

The "Old Gunsmith" used to use a pilot reamer and then a finish reamer. It is the current gunsmith's opinion that the pilot reamer was run into the barrel too far and then the finish reamer was used creating the ridge and the shoulder angle issue. I am sending the barreled action to Mickey Coleman for a set back and chamber...If the barrel didn't shoot so well I would have just changed it out.


Robert

Flock dat, let MRC put a new barrel on it. His "smith" screwed up, fixing it for you (at no cost to you) is his problem.
IOW why should you be on the hook for $100 (or so) to repair a "factory" defect?

Jeff at MRC has offered to repair the issue once he saw the pics even though this occurred before his ownership and was done by Montana Rifle Barrels which is a different company.

Robert

Whoever did the chambering should repair it free of charge.....it's just not right.....possibly one thread adjustment will fix it but it might take two.....

If MRC is responsible for the chambering I'd certainly return it!

quote:

Originally posted by Bruz:
...Jeff at MRC has offered to repair the issue once he saw the pics even though this occurred before his ownership and was done by Montana Rifle Barrels which is a different company.

Sure speaks well for Jeff.

quote:

Originally posted by Hot Core:

Sure speaks well for Jeff.[/QUOTE]

Hot Core,

That's what I thought and Mickey agreed. So it's leaving for MRC this afternoon.

Robert