Quote:
Originally Posted by Prairie Dog50
Thanks guys, I'm new to using a chronograph, I think we had it at about 10 feet!!! That explains alot...I'm guessing because of these inaccuracies that I will need to shoot again with chrony at 18 feet, and then redo the drop data.

If you have your screens set at 4' between the front screen and the back screen use the 4', times
4 or 5 to get 16 or 20 feet and then you can calculate Actual muzzle velocity by the velocity drop
between the screens (If you have a proof screen) Example: 5 ft/sec loss in 4 feet x 4(16') = 20
ft/sec more than chronograph velocity. (Note : this is not exact because velocity loss starts at
the muzzle but it is very close).
This will make your drop tables as accurate as possible but you still need to shoot at range to
verify actual drop.
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