Interesting info from new series on the discovery channel.
There is a new series called Weapon Masters. Episode one is the Katana.
Thing that is interesting to this thread, is at the end they shoot a real one, and the shows made one. Both cut the bullet in half, but the show one is just sharp, and the real one is polished. The real one shows almost no effect, were the show one has a trail of lead on the blade. The forumlate that the lack of polish on the show one actually increases the drag.
This is going to be an interesting series because they do all sorts of acicent weapons by the look of it.