'Shotguns have dkb/dbt' - where did that myth (?) come from?

[vicky_molokh]

Greetings, all!

Several times in my life I've encountered the opinion that shotgun attacks have so much 'push' that despite not penetrating the armour (vest or whatever), the blast is enough to break ribs, cause internal bleeding etc. I've even heard of an 'advanced' bulletproof vest which was made not only hard but heavy specifically to resist this 'shock'. I think this is wrong, judging by many posts of the local guns experts, but of course I could've misinterpreted them.

So it's a myth, right? Where did it come from, especially the 'shot-proof vest'?

Thanks in advance!