Drastic BC change from 800 t0 900 yds??

I haven't shot 140 VLDs but what I can tell from experience is we [Finnish LR shooters] were having some issues with a couple of Lapua projectiles a few years back. Turned out we just didn't have enough data and we were experiencing the effect of refraction. We start shooting early in the morning to avoid wind, and when the sun comes up, the temperature gradient at near ground level can be steep.

I'd be surprised if G7 didn't work out just fine for a typical VLD.
 
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