Scratch marks on neck of PPC Brass - why?

K

KevinPhipps

Guest
Dear All

Does anybody know why I am getting scratch marks on the neck of my brass (see attached photograph).
The brass is for a 6mm PPC Stolle Panda action (263 Krieger barrel with Lapua brass cut to 8.7 thou neck thickness).
I have this same scratching problem on brass from two PPC barrels, so I am guessing this is not a defect in the barrel.

Are these scratch marks likely to affect accuracy as I am trying to cut some brass for WBC 2015

PPC Neck.jpg

Many Thanks

Kevin Phipps (UK)
 
Are these fired cases? If so, how are you loading into chamber? Pushing them i with finger or laying on bottom of action and having bolt push cartridge into chamber?

Only thing I can think of is the chamber reamer or chambering operation has a problem.
 
Scratch Cases

Travelor said:
Are these fired cases? If so, how are you loading into chamber? Pushing them i with finger or laying on bottom of action and having bolt push cartridge into chamber?
Only thing I can think of is the chamber reamer or chambering operation has a problem.
Click to expand...
Hello
These are fired cases, and I am laying them on bottom of action with bolt pushing into chamber. The brass has been used a number of times, but there is only one scratch mark, so maybe something happened when I fire-formed.
What confuses me is I have two sets of brass (suited to barrel) where this has happened. I wonder whether I need to re-cut new brass and start again.
Thanks
Kevin
 
Are you sure the scratches aren't there prior to firing? Could be from neck turning and the line doesn't show-up until the brass carbons. Then again, if it's in the same spot on every case I'd have to defer to the chamber or how they're entering the barrel.

-Lee
www.singleactions.com
 
One question for you:
Are you using a neck sizing die which accepts collets?
For some dies, the collet must float to center itself. Those collets also have a single direction, usually indicated by a small radius on the side which should face down towards the bottom of the die.

Just an idea...

Phil Fortin aka tazzman
 
Polish a neck such that it doesn't have the "mark". Shoot it, clean it marginally and look at the case. If the mark is more than supeficial you may have a chamber "defect". If the rifle shoots well in spite of this - just shoot it.

The rifle needs to shoot a flat .200 or better at 100yds, it appears, to be competitive for the match you're planning.
 
Hey Kevin with all those deep scratches. I am curious. What does the target indicate?
Maybe turn the necks a little more. .0082".....
 
Are you using an ejector? There shouldn't be any reason to get a mark like that from the chamber itself. If you have an ejector, I'd take it out and see if you still have the same problem. If it's the ejector causing it, you need just enough tension in the spring to have reliable ejection, but not too much pressure on the spring. Another place to check is where the coned breech meets the chamber edge on the barrel. That edge needs to be slightly rounded, no sharp edge.
 
It's been a month since the question. What did you come up with that was causing the "scratch"?
 
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