Never heard of such a thing. Even if they were, after fire forming them and trimming them to length, they would fit your chamber as well or better than any other new brass. I pretty much only use Remington brass for rifle calibers in part because its so easy to get.

There is some truth in dimensions being incorrect on Remington brass for foreign cartridges in particular 6.5x55, but all American cartridge companies are guilty of this since they don't want to spend the money on tooling to make the rims a few thousanths of an inch wider. In such circumstances, more expensive foreign made brass like Lupua make the cases to the correct dimensions, though the difference is pretty much academic.

Alcohol, Tobacco, and Firearms... who's bringing the chips?