[Rules] T-34A/B/C? And T-34/57? And ZIS-30 57mm SPG?

[G. K. Zhukov]

I am not aware of a T34/57, except perhaps as the A20, which is the prototype of the T34. The ZIS-30 always struck me as less of a tank destroyer, and more of an AT gun on a tank chassis, sort of like the PzJrI and Marders. If you intent is to make one, look up the old old Soviet tank leader article from APL and get to work with Inkscape. I wouldn't change the AT values from the 57mm, but would reduce the armor value of the chassis.

There is an interesting article at the Archive Awareness blog you might want to check:

Soviet 57mm Guns

Maybe the 57mm should deserve an upgrade to a "6" after all.