[Mobhack]

Javelins are top-attack missiles, so they get more than the average top armour hits - therefore the front armour is usually irrelevant. The thin roof armour is what gets attacked. Also note what I said above - HEAT can (like solid shot) also over-penetrate as well as having fuse failures (0 or so pen). penetration is a bell-curve distribution, statistically. Bigger HEAT (and AP) will do overall due to size (WH) than little ones, and little ones like 40mm grenades, are penalised since they may make a little hole and blow out the ear-wax of the crew, but unless the teeny jet hits something vital, they are firecrackers. Bigger bang (WH) is better, especially for chemical energy rounds.