I have had a chronograph since the mid 80's so you know how old it is, it's the original chrony I have to write down the velocity of each shot in my shooting booklet then add them up and divide to get the average, it still works good, seems to still be accurate but have never checked it against another one to see.
A close velocity is all that's really needed, we were shooting out to 1224 yards a couple weeks ago using book values to get us close then making adjustments based on bullet impact, it works just fine.
I shoot my hunting rifles out to 600 yards and mark down the actual adjustment based on actual impact and not velocity on an I phone program, I never really chase velocity as most of the time I find that the most accurate load is not the max, and 50 fps isn't going to affect bullet performance on hunting loads out to 600 yards.
Sorry this is a bit of a derail to the original thread.
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