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Its most likely chrono based like our good Mr Stanton has already diagonosed.
I'm sure your aware of this but I will mention it anyway, Ammo left in the sunlight will raise the temp of the ammo and you can see some wild velocity changes and if your sky screen spacing varies any it too can cause diff readings from time to time. Ignore this last part if your screens can only be placed the exact same time from setup to setup. I have a home made sky screen holder and found this prob untill I figured out what was causing it. Hope this helps. That was some fine Iron sight shooting. JSanders
 
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