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I find a lot of advantages with a chrony, among them knowing exactly what velocity my load is producing. That is important for several reasons, as others have said, it is necessary to work up a range card, it also helps to determine if the load I am producing is performing the same as the test data on the load chart, and it is a very good way to measure consistency of loads.
Others are : if I know the exact velocity at which my rifle groups a certain bullet and I want to change to, for instance, a different brand of brass, I can tweak the load in the new brass to the same velocity and use that as a starting point It helps know where I am at with pressure when working close to max loads, and as many others have said, I just want to know.
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