120mm mortar minimum range is more like 400 m.
105mm guns can usually be used in direct fire (some even have shields), so minimum range is not really an applicable concept unless you need to overshoot a short LOS obstacle.
Turret 120mm mortars (like BAe AMS, Swedish AMOS and Russian gun-mortars) are breech-loaders and can be used for direct fire on an AFV as well. Turret 60 and 81mm mortars exist as well (France).
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