I use reference marks on optic mounts and white/red/blue on optics- with white for range ammo zero (mine is handload so it never varies) and red or blue for carry ammo. This for pistols that actually get carried as well as shot at range.
Barring an optic going tits up (2 RMRs did), I don’t verify zero unless I start shooting WAY off of aimpoint.
And this has only happened when optics themselves went kaput.
Obviously, if I change carry ammo a re-dial is in order.
A true "Gun Guy" (or gal) should have familiarity and a modicum of proficiency with most all firearms platforms.
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