Shot nice the Sig 2400 used the Applied Ballistics APP, you could load the app and and calibrate/check your previous drops to those in the app. I have done this and it worked out quite well when actual drops/ballistic outputs were then checked with the 2400 at the actual ranges.
If it were me I would go through the recalibration using the APP, but still do a field check at long range to check the outputs if the Sig 2400 prior to my hunt.
If it were me I would go through the recalibration using the APP, but still do a field check at long range to check the outputs if the Sig 2400 prior to my hunt.