270 WSM case neck problem

[earl1704]

Annealed my 270 WSM brass for the first time, when I run the brass through a full size RCBS die I get groves evenly spaced all around the outside neck area. I can run my finger nail around the neck and can feel (as well as see) the groves or ridges. They are vertical and evenly spaced from the mouth to the shoulder. I would think to do this would require a "pattern" inside the FL die but I have used this die before and never had this happen before. Does anyone know what would cause this or if the annealing had anything to do with it? Is it a problem or just different? I have taken the FL die apart and cleaned it, moved the de-capping pin up and down a bit and still have no change.
Earl1704

 

[winmag]

Try using a sharpie on some in unanealed brass, & run it thru. That'll yell you if it's your die or not.

 

[bigngreen]

What is the length of your brass before and after sizing?

 

[Joe King]

There's likely some crap in your die, I've noticed this a few times as well.

 

[earl1704]

Thanks Joe you are right, after your comment I got to thinking maybe its something in the die I couldent see and called RCBS, they said yep its called galling which is where some of the brass rubs off in the die. With each sucessive case more and more brass rubs off and sticks to the die. I sent it in and they said they would polish it up. RCBS also said it happens because we (I) dont lube the neck when resizing. Well......I lube the necks........... now.lightbulb

 

[Joe King]

your welcome

I'm betting folks will have issues with this, but I don't wipe of the case neck either before I size it. Every time I've sized a clean case case neck I've noticed marking, but these case where also freshly annealed so take for what it's worth to you.

 

[bbutturff]

I've noticed this before even when I do lube the outside of the neck. You can take the die apart and polish it using a properly sized bore brush wrapped with a patch and some polishing paste. I use Iosso Bore Cleaning ans Polishing paste.

Good luck,
Bruce