Novin said the added expense will drive many people away from a sport that is part of American heritage.

CNN: Should hunters switch to 'green' bullets?

Available studies -- particularly the one from North Dakota -- prove that point, said Ted Novin, spokesman for National Shooting Sports Foundation.

CNN: Should hunters switch to 'green' bullets?

Mr Novin is perplexed by, and therefore wary of, the seemingly contradictory messages on guns that Mr Obama has put out during his time as an Illinois senator and as a presidential candidate.

ECONOMIST: A surge in the run-up to the election