.338 Edge brass prep

[justgoharder]

any ideas what i'm doing wrong that i get these lines in the brass?
it only happened to about 1 in 10 or so and i didn't even notice until after i had necked up a bunch. the brass was new.

http://www.flickr.com/photos/32752830@N03/4052850043/in/photostream/

 

[ROBSTER]

I HAVE GOTTIN MARKS SIMILAR TO THAT GOING FROM 7 MM TO 338 AND WAS TOLD TO MUCH LUBE AND TO USE POWERED MICA ON THE INSIDE OF CASE NECK.
JUST MY 2 CENTS WORTHgun)

 

[BH Hunter]

Lube dents. It will shoot fine, can be remedied by one shot spray instead of lube. BD