If your benchrest set-up is good, then the shot should break where the crosshairs are lined up each and every time. Calling shots is not applicable then. If for some reason the rifle moves when the shot breaks, then you should see it and call it. But, that is indicative of poor benchrest form.
Being able to call shots while shooting from various positions (especially standing off hand), allows you to avoid chasing zeros when there is really no change needed.
Now, regarding benchrest, if you mean that you read a wind change just as the shot breaks, and mentally note that the shot will land off mark and by about how much, then you are on your way to good wind reading skills. Now you just need to learn to predict those changes and not break the shot off at those times.