A standardized system makes it a more efficient process. At Gunsite, we teach methods for directing the shooter to the target, then a system for executing the shot and corrections. Once the target has been located and ranged, you need to index the solution. Here, the keywords are DIAL or HOLD.
Spotter: Shooter, DIAL up 4.2
Shooter: Roger, up 4.2
Now we run the process to execute the shot.
Shooter: On target (This indicates the shooter is indexed and has a shooting position)
Spotter: Spotter ready (The spotter has a wind call ready and has positioned the spotter reticle on that hold)
Shooter: Shooter ready (With the last little exhale to the respritory pause, the shooter has the target centered and the slack out of the trigger)
Spotter: (Wind call. Direction first, then distance in decimal mil/moa.)
Sniper: place reticle on the call and press the trigger! Call your shot if an error is made! Run the bolt and stay on the target!
Spotter: Calls any correction, Elevation first, then windage, direction, then distance.
Don't say spotter ready if you are not prepared to give a wind call. Position the spotter reticle on that call, so when you see the trace/splash all you need to do is say the correction out loud. Don't tell him where he hit, tell him where to hold.
Don't say shooter ready until your position is set and you are ready to press the trigger. The wind call is the command to fire, nothing else needs to be said. If I give you a wind call, SHOOT!
Calls need to be direction first (with one exception) then distance. This way the shooter can act on each piece of information with no need to remember something. If you say .7 left, I can't do anything until you say the whole thing. If you say left .7, I can start moving the reticle left to the target edge and continue until I get to the specified value.
Standard holds. We use the following standard calls.
No Value or Center
Favor Left/Right (This is the exception. By saying FAVOR, you are telling me to hold halfway between center and edge, now all I need is the direction.)
Left/Right edge
Left/Right decimal mil/moa value ( Don't say left one half, right three-quarters or other such nonsense. Much harder for the shooter to process than a decimal value)
I've yet to see a better system, or a reason to change anything about the way we run the process. This takes a minimum of time to both learn and execute.