What was this fired through?

[pdog2225]

I recently purchased some fired brass online. There was several pieces with these raised lines on shoulder and body of case. Tried to resize one just out of curiosity. It was not happening. Just wondering if anyone has seen this before and what could have this been fired through?

If you resized them you may have grit embeded in your die, been there,done that. I would try using a .45acp sizing die and run the brass thru it. There is not as much friction as a normal die and easier to remove a case if you get one stuck. Pdog2225

 

[Webster]

I recently purchased some fired brass online. There was several pieces with these raised lines on shoulder and body of case. Tried to resize one just out of curiosity. It was not happening. Just wondering if anyone has seen this before and what could have this been fired through?

Could be just a hard particle in the die that got dragged down the case as it was sized?

 

[DShortt]

Anyone who sells once-fired brass run through a barrel with a fluted chamber without stating that is an ........

Fill in the blank.

My thought *might* begin with 'a' and end with a a 'e'.

 

[Krogen]

Hammer Forged Chamber...?

I've been looking at barrels for a couple of months now, and am trying to find out about different manufacturers. Specifically, I'm looking for barrels that have the chamber hammer forged along with the rifling. My research has not yielded much info: I read somewhere that Knight's hammer...

www.snipershide.com

"The HK hammer forging process includes the chamber. The barrel is manufactured complete with chamber in a single operation. To perform this the forging mandrel includes the chamber form behind the rifling mandrel. The bored and honed blank moves over this during the forging process to create the rifling and the mandrel is moved forward in the final stages so the hammers form the steel down onto the chamber form. The process creates a near perfect concentricity and angularity between the chamber and the rifling but this is a side effect not the base intent. At HK we choke the muzzle section of the barrel. When run as heat treated and chrome lined machine gun barrel the manufacturing process creates a grain flow that follows the chamber contour and the dimensioning of the bore extends the barrel life considerably (specifically when firing heavy jacket or AP type projectiles at high rates of fire). The manufacturing process to forge in the chamber does have its own complexity and the reduction of area of the bore required to allow the chamber to be included has advantages but also some disadvantages unless extreme care is taken.

Look to the barrel alloy and the heat treatment in preference to the manufacturing method.

Chamber flutes are not forged in due to the problems with extracting the mandrel from the finished barrel. Originally they were cut on a most wonderous machine that had lots of flailing steel parts and no guards whatsoever. Today they are EDM formed.

I would observe that the new steel barrels from Bartlein are an excellent option."

Thank you! That's very interesting. Today is a good day; I learned something!