The metric system is better than english units!
Its been a very long slow process and all we have now is both systems.
If the correction is found in MOA then you have to convert it to your Metric/English unit.
If the MOA is on the scope no need to convert to Inches or mils.
Look at your drop chart or plug your numbers into a palm find the MOA needed set it on the scope, or just use the MOA reticle! (NO converting to any unit)
I agree best deal is to be consistant!
To each his own, I'm old school and don't use metric much.
I don't even like to convert to inches unless I have too.
as far as ranging the MOA it close to inches and my brain just thinks that way! when I look at an elk I think 30" chest or a deer I think 20" chest. If I was converting it to metric the deer or elk would die of old age.
The chart is useful for SFP scopes of any reticle.
I've used exbul program to mess with the subtention but just use 22, 11, or 5.5 because, You just keep it in your head 2MOA@22
, and 8MOA@5.5.
Its worked for me for 5 or 6 years.