A chrno is a real piece of equipment for a reloader if nothing else you find the factory ballistics are 90% BS. If you base your expected velocity on factory load or duplication load data you are going to get surprised. But it really helps to see how the powder charge is progressing from powder to powder and it does not take long to figure out that with some powders 2 or 3 grains gives you little increase in velocity.
But if you are working sub sonic loads a Chrono is an absolute must because you have to get below the high 100% in the extreme spread so you are always sub. Also if you want to shoot in matches with major and minor classes, you need to know for absolute sure.
It is a range tool that is very useful just like a spotting scope.
Ed
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