Dave,

If you want to track velocity deviations, the most common, inexpensive light-screen chronographs don't cut it. They'll usually show an average velocity very similar to more expensive models, but the individual velocities of each round won't be very meaningful for figuring deviations. If you just want to know the average muzzle velocity of several rounds the cheap ones work fine, but their isn't enough space between the screens for valid deviation calculations.


“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck