I wonder if angle of impact has anything to do with it too? A mortar round is fired on a high arc, so would usually impact in a more vertical position allowing fragments to be relatively evenly spread sideways, while an artillery shell is usually fired at a flatter trajectory. If it were optimised to spread sideways from the round, a large proportion of the fragments would be directed downwards into the ground while more would go up into the air.
That's overly simplified, but I hope you can understand the general idea.
All in all though, a 105mm round is going to be about as healthy for you as catching a 4.2".
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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