On the other hand, an 82mm mortar shell will not harm you unless it directly impacts your head. You can run through a rice paddy with these things going off 2-3 feet away and not get a scratch.
Corollary to that: they also all contain a 55 gallon drum's worth of gasoline. All artillery shells also contain enormous amounts of gasoline. It is easily possible to outrun shrapnel- just sprint for a few more seconds and do a flying dive to the ground.
If you are the hero, snatch an MP5 off a dead enemy, but leave all the magazines, you won't need them to engage in a sustained firefight.