Have you simply tried shooting a few ten shot groups at 1000yds to see how the two loads compare? I haven’t shot F-class since 2013, but when I did, the winners never had anywhere near just 1” of vertical. 2.5”+ would have been a really great load from a really great gun if I’m not mistaken.I just got an FX120i and don't really know how I feel about it honestly. I verified quite a few charge weights that I had thrown from my .1 powder thrower. They were all within .03-.04gr.
So a .8% maximum deviation on a 60gr. charge and .5% maximum deviation on a 90gr. charge.
So for the 30 cal 90gr. charge, that has the potential for a 1" vertical deviation at 1000 yards based off 198" of drop and 2.75" deviation at 1500 yards based off 546" of drop.
I think I'll still weight my long range hunting loads to the .01 but wont waste my time on much other stuff.
If you can go shoot 2-3 ten shot groups loaded to .01 and 2-3 tens shot groups loaded with the FX120i and get statistically meaningful differences, then by all means, keep doing what you’re doing. If you can’t tell the difference though, why not use the FX120i?