What is this ring on brass about ?

[J_idaho]

Sure.
Just not sure why a change in lube caused it to disappear

Ya I know the whole thing doesn’t make since.

 

[pathfork]

He said it happened to new brass I was assuming un-fired. Maybe he meant once fired. It looks like a circular scratch from a chamber though

No it has happened with 1x fired brass that has been shot through my M14 and 1x fired brass my friend sent me. A friend just suggested it could be the collet on my Franklin Arsenal prep center I'm gonna trim some more brass and see if that's what it is. Will report back shortly

 

[fisherman987]

Can someone help me understand what this ring around this brass is please. Mostly if it is safe to use? I have taken a paperclip and felt inside and do not feel anything it's smooth. And some of this 308 brass I have not fired so that would rule out my chamber. I felt I was using enough lube and I didn't have to use excessive force going in or out. I am using a RCBS full length sizing die and I ran out of my usual red can of "One shot" (I believe then name is) so I was using some midway spray from my uncles reloading stuff (he passed away so cousin & I split up his reloading stuff) I than tried using a pad with that RCBS case lube on 25 pieces of LC brass and could not duplicate that issue. So I'm leaning towards the Midway spray. But my concern is safety and case separation. I had 11 pieces of 2x fired Lapua brass it did it on and it also did it on never reloaded federal gold match brass.

Also it was hit or miss it didn't do it to every piece. Can someone tell me what would cause this and if it's gonna cause a possible case separation issue ?

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I am suspecting that the die might have a tight spot that rubs a bit tight in that one spot, especially if this is a die that is new to you. If it is, the tight spot would be almost exactly the same distance up inside the die from the bottom as the rub mark is on the brass since the width of the rub mark appears to be about two rim thickness's deep.

 

[6.5 forever]

MTM box

Yup. Seen this many times

 

[pathfork]

That's exactly what it is. It's my trimmer top picture is before trimming and bottom is after. I feel like an idiot but I guess that's how you learn

 

[K22]

That's exactly what it is. It's my trimmer top picture is before trimming and bottom is after. I feel like an idiot but I guess that's how you learn

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You're not an idiot - one of the purposes of this forum is to help fellow shooters. No question is stupid, just some answers. Glad you are back on track - good shooting.

 

[DirtySteve]

You can also get marks like that from rattling around in a MTM or other ammo box..

 

[Ned Ludd]

A Giraud annealer leaves marks like that on brass as the pieces are turned while they are being fed through the machine. It is not uncommon for a tool that contacts a piece of brass such that it can move ever so slightly while being processed by the tool, but is still basically held in one position, to leave some kind of mark like that. Glad you figured it out!

 

[6.5 forever]

That's exactly what it is. It's my trimmer top picture is before trimming and bottom is after. I feel like an idiot but I guess that's how you learn

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Glad you figured it out. I know what it feels like to get relief of a problem.