Can a sniper rifle bullet penetrate through a tank's armor?

Answer 1

Short Answer is no, not even close, but they can penetrate APCs and other lighter armored vehicles

The origin of high power sniper rifles aka anti-materiel rifles come from the Anti Tank rifles of ww-ii such as the British Boys Anti-Tank, .55in or the Soviet PTRS-41, 14.5×114mm . The Boys could penetrate 23.2 mm of armour, and the PTRS-41 could penetrate 40mm (using tungsten cor projectiles) at about 100m, and only if the shot was fired 90 degrees to the target (otherwise the round would glance off)

While the PTRS-41 could penetrate the side armour of German medium tanks Pz IV and Panther, the Germans were quick to respond to the problem by upgrade there tanks with additional side armour skirts know as Schürzen rendering anti tank rifles useless agents tanks