I found a post which claims combat gauze is good for ten years after the expiration date, but I am afraid this is no better than a rumor, especially since the product hasn't been around that long.

http://www.survivalistboards.com/showpost.php?p=3481908&postcount=71

It would be nice if we knew the active ingredients and how long these things last in storage. There's science in here, and I'm sure there is an answer.

I'm sure I'm investing too much time and energy in this. People getting shot on the range accidentally is a very rare occurrence. Driving to the range is probably more dangerous.