http://www.achtungpanzer.com/the-new-generation-of-soviet-armor-vs-tigers.htm
"In February of 1944, T-34 was rearmed with the new long-barreled 85mm S-53 gun and then in mid-1944 with 85mm ZIS-S-53. This new gun could penetrate the
side armor of the Tiger I from a distance of
800 meters and the turret side from a distance of 600 meters. It was not enough-as before, the Tiger could destroy the T-34 from a distance of 1,500 to 2,000 meters."
Considering the side could be engaged at 800 meters and that the frontal armor was 20mm thicker, that shortens the engagement range for the 85mm from the front further, about 300-400m is what it was.
Nice to see Katitoff spreading Soviet biased information. Those russian tests are bullshit and known to be adjusted into the soviets favor. Alone the title: "70 years of victory" coupled with a red flag and fist should give you enough information who posted that data.