Guys I am in need of some help. I am trying to thread my first barrel and I have ran into a snag. I am using the grizzly rod method on a factory remington varmint barrel. What is happening is I can get the barrel to run true at the muzzle and 2.5 inches in but I am getting a difference of .006 when moving the rod between those 2 spots. It will run right at 2 tenths of concentric for that 2.5 inches so I don't know if this normal or I if I am missing something. Thanks for the help.