I've fitted thousands of chromoly barrels over the last forty years and have blued the bore of each and every one of them. I do think bluing can make the surface just a little bit sticky. I once built a 35 whelen on a 98 Mauser. The rifle got iron sights and sight installation was done before blueing. When it was all done, I pulled the barrel and blued the rifle. I had a hell of a time turning the barrel in to register with the sights on top. I finally lapped the threads a bit with JB compound to set it up. GD
