Ring on shoulder of sized brass?

[Chips26]

Anyone know what's going on here? Trying to size .243 brass, mixed federal and Hornady. Using RCBS full length sizing die. I measured the shoulders and bumped back a .001.
I've got this bright ring on the shoulder of the brass. I cleaned and checked my die and it still did it.
What am I doing wrong?


Edit: Damn I feel dumb, lumberjack78 had it right. Coming from spinning in my comparator!

 

[XLR308]

Looks like it could be from a tooling mark in the die.
Remove the die and pull the stem out for better access, use something to feel for a tooling mark or ring in the shoulder section of the die that is transferring to your brass.
A set of dental or cleaning picks would be ideal just don't get to aggressive with them and scratch the die up.
If you can feel a tooling mark in the die contact the manufacturer for a replacement.

 

[Taylor4862]

Another possibility is that it's not sizing that last part of the shoulder due to not going far enough into the die, run a piece of brass through it set up to bump the shoulder a little farther back and see if that gets rid of it.

Looks quite similar to something that happened to me when I first started reloading and that did the trick for me.

 

[lumberjack78]

Could be from your comparator as well. As you spin the case in it to get the right number, sometimes it leaves a ring.

 

[MtnCreek]

That looks like a Lee die, not RCBS.

 

[Olen_4504]

Could be from your comparator as well. As you spin the case in it to get the right number, sometimes it leaves a ring.

this! ^^^

 

[spife7980]

Anyone know what's going on here? Trying to size .243 brass, mixed federal and Hornady. Using RCBS full length sizing die. I measured the shoulders and bumped back a .001.
I've got this bright ring on the shoulder of the brass. I cleaned and checked my die and it still did it.
What am I doing wrong?

So its there immediately when you extract it from the die and its not there when you insert it into the die? I, too, suppose you could be using the .400 gauge and thats whats causing it.

Edit: Also, unmix your brass and make this easy on yourself. A bit of organization will save you a lot of frustration down range.

 

[lash]

That looks like a Lee die, not RCBS.

Sure does.

Amazon.com : Lee Precision Pacesetter Dies : Sports & Outdoors

Amazon.com : Lee Precision Pacesetter Dies : Sports & Outdoors

www.amazon.com

 

[Chips26]

Another possibility is that it's not sizing that last part of the shoulder due to not going far enough into the die, run a piece of brass through it set up to bump the shoulder a little farther back and see if that gets rid of it.

Looks quite similar to something that happened to me when I first started reloading and that did the trick for me.

Sure does.

Amazon.com : Lee Precision Pacesetter Dies : Sports & Outdoors

Amazon.com : Lee Precision Pacesetter Dies : Sports & Outdoors

www.amazon.com

That's my universal decapper in the press.

 

[Chips26]

So its there immediately when you extract it from the die and its not there when you insert it into the die? I, too, suppose you could be using the .400 gauge and thats whats causing it.

Edit: Also, unmix your brass and make this easy on yourself. A bit of organization will save you a lot of frustration down range.

I am doing them by batches, I caught it on my Federal brass first.