I've landed 3 75mm HEs on the rear panel of an M3, at an angle (45° to 60°), from behind it at about 800 to 1500 yds or so, and it just kept going.
Don't have the film, and this happened after the last revision of the gv code in AH1, nevermind if it's been changed in AH2 since.
It might have been 88mm's, I posted about it after it happened.