It was done with WWII fighters, for instance. Famously, the P-38 Lightning held an edge, as its 4 M2 Brownings and 1 20mm cannon were nose-mounted, pretty much obviating such calibration (I read some pilots did not use the 20mm, as the flight characteristics of its ammo were slightly different, but that's neither here nor there).I wish you could calibrate this in outfitting