It had been known for some time RM HE has better penetration ability than other nations even if they have lower HE dmg... The OP part are "lower angle and faster reload".
And RM HE with 'higher' penetration ability, BigHarold suspected RM HE might act like AP shells (NF guide table), it can kill crews more frequent than other nations HE.
@ForcedPlayer...
As I understand it, HE from BB3 guns can not penetrate 10.5 inch UK deck armor. So you're not supposed to get 10k when Caio shooting AW L1. U should get 0-3k(hitting belt) like others.