Hazed, let's take a look at this:
"The 20mm mine shell didn't show up quite so well. A comparative test with
the Hispano concluded that there wouldn't be much difference. What the
Hispano lost in explosive effect (only half the HE), it gained in kinetic energy, and it stood a better chance of punching through aircraft structures to reach fuel tanks,
or to inflict structural damage. Once again, it was with wing hits that the
mine shell was most dangerous.
Cheers,
Tony Williams"
Apparently Tony is talking about the Hispano HE/I shell in this comparison with the mine shell which "didn't show up quite so well".
So basically he's saying 1 mine shell is an unknown bit "inferior" to 1 Hisp HE/I.
OK. Now the beltings:
A 100 round belting of MG151/20 would have 40 mine shells. The rest would be 40 Brandsprenggranatpatronen (a HE/I type) and 20 Panzersprenggranatpatrone (a "semi-AP projectile").
I haven't seen a definitive rating on these HE/I or semi-AP but I assume from what's been posted here that both of these were inferior to the Hisp. HE/I and AP/I respectively. Otherwise, no need for the mine shell, right?
Now, the Hispano belt of 100 has 50 HE/I said to be slightly superior to the best of the MG 151/20 shells, the mine shell. It also has 50 AP/I shells that are clearly superior to the "semi AP".
Now, if, and this is a big IF, AH models the belting's OVERALL leathality and NOT "shell by shell" leathality, Hispano belts will be significantly more leathal than the MG151/20 belts.
As I say, this is the way I understand the current modeling. It models overall average leathality, not shell by shell.
It may not be that way at all.