5.56 (especially M855 for some reason) also exhibits ‘fleet yaw’ for the first couple of yards when fired. Factory new barrels and ammo doesn’t matter, iirc something about the rapid application of rotational force from rifling and projectile construction
This is an important clarification, you’re right. The yaw angle is minimal in ballistic flight, the level of keyholeing in the photo is rather dramatic. Though the 5.8x42mm is standard with a mild steel penetrator like M855, and the round was definitely built with cost as a major factor - maybe a bad lot of ammo?