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Hello
Does anyone know what this strange line is that has appeared on my 303 British case.
Attachment 84420
PPU case bought new and loaded without any alterations. Line has now appeared and goes all around the case. Could the chamber be causing this.
regards Chubbs
On all of the cases or just this one? Been reloaded? Too many questions for an answer
Hi Peter
Yes on every case (over 90). Only noticed when reloading for the second time. So only fired once.
Cases from original batch which have been loaded and not been fired do not have the line.
Cases have only been neck sized after first firing.
I have tried neck sizing other cases and the line does not appear.
Regards Chubbs
I would fire one without the mark and look at it to see if it is occurring in the chamber to narrow down the possibilities.
Hi Aragorn
I am going to do this, but just wondered if anyone had had marks like this before and if it is the chamber, will it be ok.
Regards Chubbs
Wild guess if it's from the chamber and perfectly round it's probably a minor milling defect in the chamber which you might be able to polish out. But I'll sit back and listen to what the experts say. There could be more serious issues and they would be the ones to best advise you.
The reamer could have had a nick in one flute, when cutting the chamber this would happen. To remove it, though it doesn't matter, you can use a mandrell in a drill with fine machine paper and oil. Run it into the chamber and the line will disappear with polish. Remember, the line doesn't matter. It's not hurting your brass.
Hi Guys
Thanks for the advice. When I run my fingernail down it , it snags. Should really say its more a scratch but very light. Was thinking that it may make the case prone to separation like scoring glass. I know brass is not as brittle as glass but its under a lot of pressure. i am probably showing my ignorance but I apologise for that. Just rather be safe than sorry.
Regards Chubbs
Maybe, but I wouldn't worry about it. Specially if you're neck sizing and use that brass in that rifle.Quote:
Originally Posted by Chubbs
A stab in the dark from an old reloader, it looks exactly like helping the chamfer tool especially LEE being placed on at an angle instead of square
Dick
You're thinking that after trimming, he case mouth chamfered with the Lee tool and made this mark by hand?Quote:
Originally Posted by Aussie48
Well Chubbs, did you trim, chamfer and reload these cases? Are you using a Lee deburring tool?
Exactly BAR if you hold the LEE deburring tool at an angle to "help" it chamfer the outside of the case mouth that is exactly the mark you get, I suspect other deburring tools will give the same result.
How do I know? I did it myself very early on in my case prep, old, crotchety and wanted to get it done faster.
Dick
You're correct of course, I've done it myself. I have one of those, prefer the RCBS tool though. I'd forgotten about that.Quote:
Originally Posted by Aussie48
Now if we can only hear back from the OP on this...
Thought the same thing.Quote:
Originally Posted by Aussie48
I had the exact same thing Saturday.
2 shells out of 30 show that line at a tad less than 24 mm from the base of the shell.
One is like a scratch and the nail snaps at it, the other one is a simple sign.
I use only the Lee Reloader, so no trouble with presses, wrongly set dies etc. Also the chamfer tool is innocent. It does not reach that low.
And my loads are quite mild. 140 grs of N140 behind a 180 grs FMJBT ball. Large rifle primer and oal of 78 mm.
Nothing strange or hot.
Hi GuysQuote:
Originally Posted by Aussie48
Went to the range and fired some from the same batch, no mark. I have't tried reloading them yet but I am beginning to think Dick has probably hit the mark. Unfortunately can't verify this until end of the week.
Regards Chubbs
If they aren't there when you fire then it's the case mouth chamfer action that does it...
was my first thought when I seen the pictureQuote:
Originally Posted by Aussie48
Thanks Guys
I can now confirm that the line is indeed made by the Lee Chamfering tool.
Regards Chubbs
Good to know.
This leaves me with my own question about my marks.
I'll shoot the lady next Saturday and keep an eye on each shell.
Hope its not the next door neighbour Ovidio:madsmile:
And, it won't hurt the casing at all.Quote:
Originally Posted by Chubbs
Well Cinders, I'm a lucky guy with my neighbours.
They are all hunters or military.
No trouble with guns at all.
We already have a defence plan around our block in case.......
Put up joking, but it is really good.
We have firing positions on road level, on the first and second floors and we can cover 360° around our homes and the road going in between for at least 200 meters in both directions.
Lots of fun going through the "plan" during our BBQ afternoons.:super:
Glad you found the problem. I had a similar mark appearing on Krag cases, but I know it was my doing. After I got my Krag I also got a good deal on a 30-40 Improved reamer. I was going to ream the chamber out, put the reamer in as far as it would go with its larger shoulder and lightly turned it with my fingers. Then I thought, wait, I better read the CMP rules. Krags have to be in their original chambering. Operation canceled, but it did leave a mark like yours. I've reloaded the cases many times without any problem.