A chronograph is also good for the ladder method of finding an accurate load. Instead of firing multiple 3 round loads, you start at the minimum load data, and reload 1 round for each up to maximum in .5 grain increments. Example; if my load range was from 42-46 grains of powder, I'd load my first round at 42, my second at 42.5, all the way to maximum. Then you chronograph the loads, and two of them will be real close in velocity. That's your sweet spot. Choose a load between the two, then find the sweet spot for case overall length. So instead of firing 25-50 rounds for load development, you're shooting closer to a dozen. Saves a lot of $$ when you're trying to dial in a long range load.