Soviet 14.5mm ATR and 12.7mm HMG armor penetration test data
 

Like the title says, real data from Soviet WW2 archives:

http://sovietguns.blogspot.fi/2014/0...-vs-tanks.html

Somewhat mysterious is the "DK" bullet for 12.7mm DShK MG. It's probably a tungsten core bullet judging from the good penetration, but I have never seen that acronym before. All tungsten core bullets I have seen have been some variation of "БС" (transliterated to "BS").

In any case, this report again confirms that the Soviet 14.5mm ATRs were effective against light armor at ranges well over 500 meters, although naturally the shooter's ability to see and hit targets with the iron sights provided would have been the limiting factor at really long ranges.