With in 200 yards and less, there's not a whole lot of difference in shot placement if the weapon was correctly zero'd in the first place. Beyond that, technique and experience comes into play. A couple of inches in shot placement, between shooters of similar stature, is a stretch, but there are some folks that don't use proper techniques or different spot/cheek welds, eye relief, etc...which will result in the POI being way off. If you're looking for more precision, only small adjustments or fine tuning should be required. If you have to share with just one other person, I suggest you both head to the range, observe how the other shoots, and either record the differences or come to a happy medium you can both live with for acceptable accuracy. Then validate that zero in different shooting positions that you may employ in the field. If sharing with several folks, Zero with your particular optic, and swap them out when you guys pass the rifle back and forth. If limited to iron sights, with several people, I would consider it a serious liability. You may want to get your department trainer involved to write a "white paper" study for training, and discuss weapons not zero'd to the individual officer, etc.. increases liability, etc...and solicit the Chief, to retain the option of officers carrying their own weapons, or at least, putting rails on them so you can swap optics and reduce liability if responding to an active shooter.
For God and the soldier we adore, In time of danger, not before! The danger passed, and all things righted, God is forgotten and the soldier slighted." - Rudyard Kipling
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