Thread: trajectory validation distance

So question for the wise folk on here, when validating drops how far do you need to shoot to get an accurate estimation of MV? Looking to validate a 7mm08.
Also is 2 points enough, eg 100yd zero check and measured drop at say 400yds? Or would you shoot 200 and 300 as well?
Im guessing like most things the more data points the better but would two work out accurately enough?

Cheers