Anti-tank rifles are especially useful as you can park yourself WAY the hell and gun away from the tank. I got 15 or so tank kills on Olympus as british boys rifleman, just sitting in the grass of the hills and popping Pz2s, 222s, and hanomags, and the occasional Pz3. While it doesn't do a lot of damage, either the tanker gets confused as hell, and because you're hidden far away, can't spot you, or he retreats.