didnt this gun penetrate better then any gun in he war?
No, The 152 was an assault gun with an extremely LOW rate of fire - I think (top of my head) 1-2 rounds a minute.
With APHE you are looking at penetrating 125mm at 1,000 yards .
There are a number of 100 and 122mm guns far better off then the 152, for example Su-100 which penetrated over 120mms at 2,000 yards.
Then again this would be a heavily perked tank, however it would be able to combat a King tiger, and Panther/Tiger for sure.
Su-152, Su-122 ISU-152 and ISU-122 were all assault guns, they were made to blast through german defenses not combat tanks, in the last ditch effort they could and in fact using High explosive rounds had a fair chance to knock out a tank with a hit to the turret ring.
Even with its horrible rate of fire, the size of the guns and penetration it would be perked which is the only down side.
Not sure exactly what it would be perked too since the only non-turret tank we have is the M3(75).