I guess I wrote it wrong.
Thing is: I can hit just fine with an assault rifle where I can't hit with a marksman rifle. Conditions are equal, target is equally moving or equally still, aim on target or just slightly off. In this case AR hits most of the time (8 out of 10), MR hits in 1 out of 3 cases (approximated, its easy to hit stationary target that isn't looking my way, but even stationary target looking my way can simply ignore 5+ bullets in a row).
Under hit box I meant how close the bullet needs to be to the body for the hit to register. If this doesn't depend on the weapon, how in the world I always hit with AR where I fail to hit 5+ bullets in a row with MR?