[SilentScope]

Are you talking about adjusting the hop up mid-game?

 

[SilentScope]

Usually most of us adjust our hop-up when we zero our rifle and then the only thing you have to worry about when aiming at your target is elevation and windage.

YES. This is what real snipers do and airsoft should be the same.

If the OP did mean adjusting hop up during mid-game, then literally it's just a guessing game.

 

[SilentScope]

If I use a friend to shoot past, what information is he to be providing me? What is the procedure there?

There are others ways but here are two I use:

1. Either have a friend use a scope/binoculars and both of you will focus on an object you're trying to hit. This will increase the odds that one of you will see the BB in flight.
2. Ask your friend to wear protection and turn his/her back. Shoot directly at your friend and he/she should be able to hear or even potentially see the BB as it passes them. You guys can simply relay the BB whereabouts (i.e. "The bb went above me by about 2 feet!") by talking on the phone or yelling really loud :yup:

I like method two because my friends are jerks :lmao: