Somehow I think two T34s firing at each other at point blank range, well...something should give, and give pretty quickly. I imagine that armor on a T34 would be pretty weak if it had a 76mm round impact the same area 4 or 5 times. At some point, well on this side of eternity, that armor is going to be so degraded that a round will penetrate.
I think HTC should revisit their high velocity armor piercing tables.