Strange scratch on case

[1holeaddict]

I just acquired Dads Remington 700 Classic in 35 Whelen. Dad supplied me with the 70 factory ammo cases that He fired out of her. I SS tumbled them and full length sized them using a new Redding FL die. While wiping the lube off I started to notice a strange scratch on every case. Normally case scratches are vertical not curved.
Anyone have any insight on how this is being caused?

 

[Cryhavoc]

were the "scratches" or marks there before you tumbled & sized?

 

[Bill Norris]

Looks like the case was turning when that scratch occurred. Like maybe a burr inside the chamber as the bolt rotated at ejection ???

 

[1holeaddict]

were the "scratches" or marks there before you tumbled & sized?

Yes

 

[1holeaddict]

Looks like the case was turning when that scratch occurred. Like maybe a burr inside the chamber as the bolt rotated at ejection ???

Normally Dad would not be lifting the bolt and pulling rearward. In order for a curved scratch you would need to be rotating and pulling at the same time. If it was happening during a Remington bolt lift i would expect to see more of a ring before the scratch went vertical.

 

[Adam in WI]

I wonder if there isn't a groove that shape in the chamber. Reamer burr?

 

[1holeaddict]

I wonder if there isn't a groove that shape in the chamber. Reamer burr?

That is exactly my thoughts.

 

[Bill Norris]

That is exactly my thoughts.

Yea, correct. Maybe it is a print rather than a scratch.

 

[Gappmast]

Low spot on the brass would mean a high spot in the chamber. Time for a bore scope.

 

[hrlincoln]

I SS tumbled them and full length sized them using a new Redding FL die.

Aside from the spiral impressions on the case bodies, I'm curious why the case mouths look like they do.

 

[Adam in WI]

Aside from the spiral impressions on the case bodies, I'm curious why the case mouths look like they do.

Second gen Lee collet neck sizer?

 

[Uncle Ed]

Aside from the spiral impressions on the case bodies, I'm curious why the case mouths look like they do.

Factory crimp marks and the left and center cases looked to have been trimmed in length removing some of the crimp.

 

[1holeaddict]

Factory crimp marks and the left and center cases looked to have been trimmed in length removing some of the crimp.

100% correct!! They are factory crimp marks and all have been trimmed.

 

[243winxb]

Clean chamber with a chamber brush, or any bronze bush a little bigger then the chamber.

 

[McFred]

I have a case somewhere that was fired in a "dirty" chamber that had a stiff-bristled dog hair in it. It left a mark on only one case near the shoulder though, not several cases in a row. Subsequent firings on that case have not ironed out the "hair line" either.

 

[matman_eod]

Does scrach turned out with polish easily? If your chamber have burr, scrach doesn't turned out easily. And you had felt resistance to close the bolt.

 

[searcher]

I'd bet my money on a slight scrape in chamber from the reaming process. What you have on your brass is very consistent with that. I have a .20 Practical tube that I had a local buddy chamber for me. It got a light, hair-line gouge in a perfect circle about half way up the case. Looks like the early stage of case separation on all fired brass. It has had no ill-effect on brass longevity or any other problems associated with it.

 

[Shaggy357]

Several things it could be, but I would bet on a burr in the chamber. Bore mop or 0000 steel wool can help locate a burr if you put one of them on a cleaning rod and spin it a couple of times in the chamber and then look at it with a good light. The burr will snag a little residue from the mop and make it easier to see. 0000 steel wool, a little Flitz polish, and a cordless drill can do wonders for a rough chamber.

 

[1holeaddict]

Several things it could be, but I would bet on a burr in the chamber. Bore mop or 0000 steel wool can help locate a burr if you put one of them on a cleaning rod and spin it a couple of times in the chamber and then look at it with a good light. The burr will snag a little residue from the mop and make it easier to see. 0000 steel wool, a little Flitz polish, and a cordless drill can do wonders for a rough chamber.

I have dealt with several Remingtons that had burrs in the chamber. They have always left a vertical scratch on the brass. This mark is a curve. I am going to bring her to Bobby Harts shop and scope it to see what exactly is going on in there.