RPR 338 damaging brass

[ACK]

First time out with the Ruger RPR 338. Mini ladder test , 285 Hornady , H1000 Federal primer, Norma brass

Then I noticed an odd deformation on some of the fired cases, it is not very deep, however it can be felt with a fingernail

Any ideas what could be causing this? I did not experience any difficulties lifting the bolt or ejecting the case. Primer was not flattened. It looks like it struck a sharp edge and subsequently dragged across it.
I inserted and ejected a fired/sized case and could not replicate this mark.
Thank you in advanced,

 

[never_summer]

Did you single load the fired case? Could be magazine or feed ramp has an edge?

 

[AIAW]

Is it just the lighting or are those necks split also?

That's a high spot or nick in the chamber (or the FL/body die).

 

[supercorndogs]

Is it just the lighting or are those necks split also?

That's a high spot or nick in the chamber (or the FL/body die).

It looks like a reflection to me.

I would check the feed ramp and barrel extension also.

 

[ACK]

Thank you for the feedback. No split necks. Thanks for the reminder, after how many reloads should I anneal the neck?
I will test with a full mag. I also have a 2nd mag to test with

 

[FLIGHT762]

Looks looks it is scraping on the feed ramp when feeding out of the magazine into the chamber. Maybe a burr on the feed ramp?

 

[AIAW]

I was thinking the feed ramp also, but that's pretty far back on the case. Not too familiar with the RPR though so I have no first-hand experience with the feeding.

 

[Anderson_A]

I get a small dent in the same spot on my creedmoor brass from it slamming the inside of the reciever on the way out looks to me by the direction of the marks the same thing is happening but I’m not familiar with the rpr design if It has a plunger ejector see if the brass slams the inside edge of the receiver after leaving the chamber/barrel extension when it’s being ejected.

On second look it may be too far back on the case to be that but worth a try I don’t know why you wouldn’t be able to replicate it at home if this was the case

 

[ACK]

Thank you for your comments. Since it is not a reloading issue (hot load) I will update the research on this link
Ruger 338 brass

 

[Huskydriver]

Try sideloading and chambering a fresh round then extract it without firing it.

If you get the same mark it's a imperfection in the chamber most likely. If you don't try mag feeding it in and extracting it. If it appears now you know it's happening during feeding.

 

[ACK]

Thanks, tried that, also loaded 5 dummy rounds, fed extracted at different speed, energy levels, could not duplicate the "gouge" Inspected all 50 rounds I noticed that on some the damage is lower and in several none existent. Noticed and addressed several sharp edges, refer to this link for latest pictures, comments

picts

 

[clcustom1911]

Next time you go to the range, single load the rounds, push them into the chamber with your finger then close the bolt behind it. That will eliminate the magazine/feed ramps and pretty much leave the chamber as the only variable.

Potentially the reamer used for your chamber could have been near the end of its life and caused some wonky tool marks which are imprinting onto your brass when it presses out against the chamber walls under pressure.

 

[vh20]

With the last two posts in mind, if you're not getting marks feeding and extracting dummy rounds, it appears that the marks might be occurring only when the round is fired and expands against the chamber wall (thus a chamber defect). Doing as CLC1911 suggests, you could also carefully mark the orientation of the round with a sharpie as you push it into the chamber with your finger. Fire the round and carefully extract it. Using your reference mark you should be able to locate where the defect in the chamber is.

 

[ACK]

Good insight. Although I did not feel any abnormal resistance/drag during extraction. However I loaded (5) different powder loads, that is a variable that could explain the different degrees of "gouging"

 

[nitronida]

I get those swipe marks on my cases if I am not careful when resizing and dont have the case centered with the resizing die on the initial upstroke of the ram....

 

[FLIGHT762]

^^^^^^^^This is a very good possibility.^^^^^^^^^^

 

[ACK]

Update. Using Swiss files I deburred all accessible sharp edges (plenty of them)
Shot 50 rounds yesterday 285 Gr; 89 Gr H1000, Norma brass. No gouges are detectable.