There is data to be recorded either way. Learning your first mildot scope won't matter. Its what happens when you buy a scope that uses a different focal plane you run into relearning it all over.
Personally I only have one mildot scope and won't bother learning the inticacies of another brand. If I was an active duty sniper I would be more in depth. But for me its a hobby shooting paper and dirt clods.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent