Additionally, from what I read of the US 4.2" Mortar in WW2, they found that the HE payload was actually greater than that of the standard US 105mm Howitzer HE round of the era. It wasn't as big as a 155mm HE round of the era, but not by much. The troops were really impressed by the wallop, as were the Germans on the receiving end of the Soviet 12.0cm...enough that they captured all they could, type standardized it, copied it verbatim and issued it in the official TO&E.
What you gain in mobility and punch you give back in range.
Dave
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