Practice
A throwaway session on the same engine the ranked competitions use. The rifle is zeroed at 100 yd: the come-up is the elevation your turret needs to reach the distance you pick. Leave it shown and dial what the HUD says; turn it off and find it yourself from where the shots land. Then read the flags and the mirage, hold for what you see, and find out what it cost you. Nothing here reaches a leaderboard.
100 to 1200
match face
Calm is easiest
5 to 30
Elevation
on = dial the HUD's number
Three practice sessions at a time. Each one frees up about a day after you start it, so there is nothing to cancel or clean up.