Tiny dent in shoulder 30br

[Kevin1990]

So I was cleaning my 30BR brass before resizing tonight. This brass have been fired 8 times. As I was cleaning the necks and shoulders I noticed a very tiny dent in a piece of brass and it's almost perfectly square. Out of the 150 pieces I noticed this on probably 20 or so pieces and it's almost identical on those 20 pieces.

I cycle my brass by firings, and all of this brass was not sized at the same time or fired at the same time. Any ideas what this could be from?

I was thinking it was maybe something in the die but, I figured it'd be on every piece of that was the case. Thought maybe something in the chamber, but that would be on every piece too. I also do sometimes tend to feed em quicker if I have a good condition, but I'm a little perplexed. Any help appreciated!

Thanks fellas

 

[WesG260]

Powder granule in the chamber.

 

[Bill Norris]

Are you allowing any sizing wax to get onto the shoulders?

 

[Kevin1990]

Powder granule in the chamber.

that makes for more sense than anything ive come up with. I am using n130 which would leave a mark similar to that!

 

[Bill Norris]

that makes for more sense than anything ive come up with. I am using n130 which would leave a mark similar to that!

Yea it could be stuck in there.

 

[Kevin1990]

Are you allowing any sizing wax to get onto the shoulders?

im doing my very best not to get any on the shoulder and neck. I'm using imperial sizing wax and I've actually been using it very sparingly as opposed to kind of applying liberally and I've noticed I'm getting way more consistent shoulder bumps.

 

[searcher]

Is it possible the last number of pieces that got sized got this dent while being sized and went unnoticed? Would explain why only on some of the brass. If there is no way that got past you, I'd also say there was a piece of crud in your chamber.

 

[Kevin1990]

Is it possible the last number of pieces that got sized got this dent while being sized and went unnoticed? Would explain why only on some of the brass. If there is no way that got past you, I'd also say there was a piece of crud in your chamber.

Very possible. I intend to thoroughly inspect and clean the die, and I'm going to bore scope my chamber, but I suspect its gone by now it if was a powder granular. I plan on sizing 50 tomorrow and shooting them on Friday. ill keep an eye out throughout the process this firing cycle and see if it re appears.

 

[jimmymac]

I have had that happen before on more than one occasion. In my case it was foreign matter of some sort stuck in the chamber because the problem went away after cleaning that area. Your brass is still fine. After the next firing you will never know it happened.

 

[SeabeeKen]

I'd bore scope my chamber and die just to be sure. If youre running that bolt fast, could something be denting it during feeding?

 

[AlNyhus]

Powder granule in the chamber...amazing how hard they can get stuck in there. Good time to clean the trigger, too.

 

[charlie b]

Mine was a bit of something in the size die (FL Forester). Was interesting that it didn't affect all the cases. It wiped out without using a brush. I suspect there was a 'blob' of grime in there and sometimes it got on the shoulder and sometimes it didn't.

 

[ELR LVR]

im doing my very best not to get any on the shoulder and neck. I'm using imperial sizing wax and I've actually been using it very sparingly as opposed to kind of applying liberally and I've noticed I'm getting way more consistent shoulder bumps.

Very sparingly is good with Imperial
You may need to clean the inside of your sizing die though
stuff gets built up in there over time