The PTRS should not exist. Fighting late war tanks with an outdated early war weapon is silly.
...The guys to our right then began firing point-blank at us with AT-rifles. None of the vision blocks were functioning anymore after a short period of time . Zwetti tried in vain to find one of the riflemen, but those guys always went to other positions and then disappeared again as fast as lightning. We reconned by fire a long the entire length of the earthen fortifications. The Russians were so sure of themselves, however, that they even threw hand grenades out from under their cover...
...The Russians had shot a hole in the radiator with their AT rifles. What could be done? Jumping ship or towing was impossible in our situation. We therefore had to try to get back over the bridge under our own power and without the pistons freezing up...
Tigers in the Mud. Otto Carius
The PTRS should have a better chance to crit or blind enemy medium and heavy tanks.