I am bit confused by the phrase 'boresight range'. Could you elaborate a bit/
Spent 2 hours to get a definitive answer, but all in vain
. Not sure about which Russian KE they use. They also use some Israeli APFSDS. Give me a bit more time.
This is the alignment of the tank sights to the gun, all tanks have to perform periodic boresighting due to ambient temperature changes ie: thermal bending of the gun tube, firing of live ammunition, etc,etc. depending on which type of tank that you are using or sight systems the ranges vary, on a M1 series the boresight range is 1200 meters due to sight parallax in the gunners auxillary sight, this is the sight that would be used if you had major damage to your turret electronics/primary sighting system, you have no power going to it.