6.6 PRC overpressure

[TXmountainhurnter]

Have a C Arms Ridgeline w 375 rounds through it. Some handloads w 57.6 g Retumbo @ 2996 fps. Recently started showing pressure signs and hints of Carbon ring (had scratches on the bullets of loaded unfired cartridges). Did a good cleaning w C-4, then bore paste and the problem persisted. Christensen was helpful in my interactions w them and had me send it back. They put a new barrel on it at no charge and sent it back. Now the problem is worse. I started the barrel break in and only got through 4 rounds of factory Hornaday 143,s that chronod @ 2860 with Garmin Xero Pro (quite slow). Each round had progressively worse ejector marks and I could barely force the bolt up after round four. Any input would be helpful as I am not sure what to do next... I sure can't shoot it as is. Pics of chamber w and w/out cartridge below.

 

[Dmagna]

Never had good luck with Christensen arms. I have had 3 do the same thing, keeps sending it back with the brass. They need to get their business together.

 

[Seabeeken]

How does the diameter of a fired neck compare to a loaded round?

 

[TXmountainhurnter]

How does the diameter of a fired neck compare to a loaded round?

Fired, .2970
Loaded, .2935

UPDATE: C Arms just called me and are going to replace the rifle. That's good customer service! Wish I hadn't had to go though this but I couldn't ask for a better outcome.
Still wld like to hear theories on the issue..

 

[Dmagna]

Fired, .2970
Loaded, .2935

UPDATE: C Arms just called me and are going to replace the rifle. That's good customer service! Wish I hadn't had to go though this but I couldn't ask for a better outcome.
Still wld like to hear theories on the issue..

Customer service would have been making the rifle right the first time. They had a chance to fix it as well. Their quality control is garbage, that rifle should never of made it to you

 

[MagnumManiac]

An overly tight chamber will do exactly what you describe.
It is an unknown until you start to measure everything accurately, calliper s are not accurate enough. My 338Edge I built was like this, tight neck, tight web line at .200" and tighter headspace than I asked for, it was in fact .002" negative headspace and the go-gauge was tight, but closed. The brass didn't like it all.
Gave me fits until I ran another chamber reamer in…

Cheers.

 

[TXmountainhurnter]

How does the diameter of a fired neck compare to a loaded round?

Fired, .2970
Loaded, .2935
Goo

Customer service would have been making the rifle right the first time. They had a chance to fix it as well. Their quality control is garbage, that rifle should never of made it to you

thanks sunshine

 

[Dmagna]

Fired, .2970
Loaded, .2935
Goo

thanks sunshine

You can say what you want but you paid a lot of money for that rifle and it wasn't right. You sent it back once and it still isn't right, if you think that's good customer service I got a bridge to sell you.

 

[Phil Rizzo]

I've personally never heard of a company loved or hated as much as C.A.
Depending on the customers luck! At least they will replace it, hopefully with an improved version.

 

[Seabeeken]

I thought about buying one a couple yrs ago. Glad i didnt.

 

[Marky_mark]

I've personally never heard of a company loved or hated as much as C.A.
Depending on the customers luck! At least they will replace it, hopefully with an improved version.

There's a tie with fierce
Both of them
You get a winner or a lemon

 

[Phil Rizzo]

I'm not sure what they cost compared to a full custom, but the difference definitely sells rifles for them. Guys like to handle one before buying, understandably.
I have enough bad luck spending for what should be upper quality, if I went the 50/50 route it would be a disaster.

 

[marksman1941]

I had a Christensen CA10 in .308 that went back twice. The first time it was destroying cases, and the replacement upper didn't even pass a go/no go gauge test. The third upper worked like a charm, but it took 6 months and a dozen phone calls to get it. I would try to sell the replacement they send you and put the money into a custom. At least you'll know it's done right.

 

[Shane Lindsey]

I picked up a used BA on here. It shoots lights out. I have noticed it pressures a little faster than I would like with handloads. Factory Hornady left ejector print, but the dual ejector springs are really tight. Loaded up some 140 Bergers and they aren't as fast as I would like and pressured up quick.

In intended to shoot lighter Hammers with it anyway and they are smokin fast.