Thread: 223 case defect

Any ideas what causes the defect shown here on the left?


A bloke at the range today was firing new ppu in 223, Winchester and some reloads.

The extracted cases had a pronounced rounded shoulder and the concentric lines around the shoulder.

The ppu cartridges gave a lot of resistance when closing the bolt.

Some of the other cases were also hard to extract.

Cheers
Pete

Was it a new rifle? Looks like its a dodgy chamber?

What model of rifle ?

I believe it was a brand new Mariln black synthetic stock blued etc.

Not sure on model but looked like an X7

Cheers
Pete

Wonky chamber....

Did he try other brands of ammo ?

Badly cut chamber by the looks of it

It almost looks like it has been pilot reamed or something then not finished?

Yes that was my thoughts too.

My advise was to stop shooting it and take it back to the shop.

Cheers
Pete

Originally Posted by veitnamcam

It almost looks like it has been pilot reamed or something then not finished?

"Improved"

nice sharp pics by the way pete

Mate has just had a similar experience with a brand new T3 although the radial marks at the shoulder weren't there. Hard to close on factory ammo, hard to extract. Could also see a mark running length wise in the chamber. To give B NZ their due they swapped the rifle immediately (was expecting to be jerked around).
The Marlin definitely needs returning and the owner needs to stand his ground for a replacement.

Originally Posted by 7mmsaum

"Improved"

With a half inch drill in a Predator cordless

looks the same as when NEA had a bad bunch of barrels my cases came out with rings on the neck