It sounds to me like this would be a good candidate for an iPhone and BlackBerry app. How many people shoot guns when they're sitting in front of the computer (other than us developers)? ;)
It's a bullet trajectory calculator. Only way I can see this thing making money is if it was made into a pocket-calculator type of thing and mass produced in Guangdong China.
It sounds to me like it's intended for developing custom loads for guns, not calculating ballistics in the field. The target market would be handloaders who sometimes spend thousands of dollars on reloading equipment. An ad-supported web app or a paid GUI app would be very viable.
I can't say more than that I would certainly not buy one, nor even use a free one. But then again, I can say the same thing about a bingo card generator too. Also, it looks like he's not trying to make a living on it, but simply break even or make a bit of extra cash.
