I went in half way on the puchase of a chronograph with a friend and on our first trip to the range it met an early demise. My friend had setlled in to his stance with an S&W 457 that he knew shot a little low, well the chrono was launched about 10 feet straight up and we only found one of those little aluminum rods that you shoot between. Oh yeah, he bought the whole thing after that. I also let a non-gun owner friend of mine touch off some 125gr federal 357's from a 2.5 snub, he was not as amused as I was.