Not sure if this is a bug or a feature.
When ADS with higher optics, sometimes there would be an adjustment process. During this process, the bullet is going nowhere close to the crosshair. See clip in the link below. Note: I did not destroy the claymore, the player next to me did.
To me, I am not sure if this is a bug or a feature. It just feels frustrated to feel my bullet is not hitting what it is suppose to hit, in this case the claymore.
It isn't until I came back and look at the recording that I found out that I was not fully ADS when shooting. When playing the game, I failed to realise this fact. I just felt I should hit the claymore, when it didn't. Maybe that is also a reason why I feel the hit reg is sometimes off.