Quote Originally Posted by Josh View Post
Most barrels have lands of approximately. 004 to .005 tall, I doubt it is the lands being wore down but the throat being eroded. This is why you can set back a barrel 1.5" and rechamber it.
I did mean throat erosion. Thanks for the correction. If brass is your concern then you can always build a 6x47 Lapua. This would be my choice if I started a 6mm build from scratch, but I haven't had any issues with that Hornady 243 brass either....