Ok so lets do the math using load data from the Nosler web site for the old fav 6 BR.
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32.5 grains of Varget goes 3160 FPS according to Nosler
30.5 grains of Varget goes 2999 according to Nosler
So, between these two loads is 2 grains of powder resulting in a velocity difference of 161 FPS
161 FPS divided by 20 equals 8.05 FPS per 1/10 of a grain.
So whatever velocity spread you actually get with an FX120 is about 8 FPS worse than it could be with a better scale.
According to JBM Ballistics (using 0.535 G1 BC)
3000 FPS drops -281.2 at 1000 yards
3008 fps drops -279.4 inches at 1000 yards
8 FPS equals 1.8 vertical inches at 1000 yards.
As stated earlier, for F Class with a 5 inch X ring and 1000 yard bench rest, competitive shooters want that 1.8 inches.
If you shoot steel, I doubt you will notice the difference, but whether you notice it or not, the error is there.
It's up to each of us to decide how badly we want to lower our ES by 8 FPS.
Please don't go off the deep end bragging about your 3 ES load with a beam scale. You just haven't tested enough rounds to see the difference. Or it was chronograph error.