ah okay. well I dont think it should be able to be one shotted with the xbow anyway. unless you mean with a lvl 5 sharpshooter.
The Crossbow's damage is ridiculous. Anyone who think's it's a lackluster weapon isn't properly hitting the headshots properly. I was one of 'em, as before I knew about the Scrake headshot area, seeing several bolts hit a Scrake between the eyes to no real effect was kinda discouraging.
Most Crossbow "Headshots" that seem weak are simply not connecting properly. I notice it all the time with Gorefasts and Bloats, due to their wobble. If a bolt connects properly with one, it's instantly fatal, even for a Non-Sharpshooter playing on Hard... A 6-player, Hard Bloat only ~1,600 HP...no match for the Crossbow's 1,800 damage headshot (See below!).
On Normal, a Level 2+ Sharpshooter can 1-shot the Scrake. On Hard, a Level 4+ can do it. In the hands of a Sharpshooter, the X-Bow gets +damage%, PLUS does 6x damage on a headshot as it always does, PLUS gets the extra headshot multiplier!
I'll demonstrate how sickly powerful it is with some simple math:
-Crossbow does 300 damage, 6x on a Headshot. So a non-sharpshooter scoring a headshot does a total of
1,800 DAMAGE! Thus, even on Hard, a non-sharpshooter (IE: Medic with Crossbow) does enough damage to kill a Scrake with two headshots in your average 6-player game. And a single one will do enough damage to stun!
-A Level 3 Sharpshooter does:
300 + 90 (30% bonus damage) * 6 (Headshot) * 1.3 (SS Headshot) = 3,042 Damage in ONE SHOT! Easily enough to down any Scrakes on Normal and most on Hard!
-A Leve 5 Sharpshooter does:
300+ 150 (50% bonus) * 6 * 1.5 (SS Headshot) = 4,050 Damage! Kills all Scrakes on Hard in one shot and will 2-shot any, even on Suicidal!