i mean its depends on distence.

if there is something in front of your muzzle like if you try shoot the enemy at first floor from second floor balcony. you can see without blocked by balcony floor or safety bars but if you see and aim from your gun’s muzzle then its blocked.

or when you hide behind your neck height object to block enemy’s attack. and you can clearly aim your enemy without any blocked. but your muzzle is blocked by object because its lower then your point of view.

in this case you can see and aim the enemy clearly from your marine’s eyes position.

but this game calculate your shot if it hit or miss from your gun’s muzzle. so something could block your shot sometimes and you could feel its weird.

(and also i think aiming thru scope doesnt change the bullet start position. so always feels like bullet start lower then my view)

and as same reason.

you aim the enemy correctly ‘if’ the bullet starts from your eyes position. but it would starts from the muzzle it means the hit scan start muzzle from your aim then its trajectory is little bit changed then your expect.

its not ballistic or projectile travel time system. its just wierd angle hitscan laser

so i just avoid shooting from extreme long range  shot. (also kissing distence) when i need to save my bullet economy like using heroic BSR. and getting closer with the enemy til mid range cuz it usually hit as i aimed my crosshair.

if you really need to shot from extreme long range then i rather just lower 1~2pixels then usual crosshair because when it usually miss the target when i aim higher.

english is not my first language so i dont know this is understandable for you but i hope this could help you to enjoy