I played it for the best part of on hour and I've seen quite some consistency in the X-Ray behaviour...
As a tip, if you're interested in the eye-candy, put realism all the way but set tactical aid (the hints I mean) to maximum.
It's less realistic but when you enter in scoped and press E you'll see a red diamond indicating the bullet drop and sway.
Managed a coupla nut-shot! heheh...
And don't miss a throat shot or a kidney one!
Once I managed to hit both lungs with one bullet.
Or try to hit a soldier in the eye socket!
This game is so necessarily gross I'm almost going to buy it!
But seriously, without that violence would be little of it...