It can pen IS-3 frontaly because of the hige lower plate.
It can pen UNANGLED KT.
Its can pen ANY american heavy... Note that those have really weak vehicle armor...
Sorry but there is a reason why Chaffe is balanced like tier 7 heavy.
Also, if you meet an idiot that uses AP shells with the 152mm then no wonder. That cannon is artilery gun, its meant to use HE rounds and thanks to Wolverine's open turret its instakill...
True, frontal shots are useless, but if you can get around the sides and rear, they're very deadly. I managed to torch an IS-3 once in my older Wolverine. That was funny to me, until his artillery pals locked me in.:(
I was running rings around him and couldn't pen him anywhere for about 2 minutes. After wasting many shots I found that the only way to pen him was hitting the hatch on the back of his turret. Problem was, it had to be a completely straight shot to pen and my gun did tiny tiny damage (maybe only 8%).
Took a while but I won in the end. He never even got a shot off in that whole time.