Reuters seems to be counting Pittman-Robertson dollars as sin taxes. PR has been around for quite some time, and as far as I know has been 11% pretty much its wholeÂ existence. The dollars used for fish and wildlife management, as well as public ranges. Even so, it might be unconstitutional. The Heller ruling probably puts upper limits on how much governments can consider firearms and ammunition to be a “sin” and tax it accordingly.