The Gurney Equations14 are a range of formulae used in explosives engineering to predict how fast an explosive will accelerate a surrounding layer of metal or other material when the explosive detonates. This determines how fast fragments are released on detonation of an item of ammunition. This initial fragment velocity can then be used with other ballistic equations to predict either danger areas or fragment penetration.
So what should the mass of shrapnel be?
I was going with 0.1 gram for a modern grenade. 0.5 gram for a modern mortar shell.
Anyone think more?