For example Tomas_of_Miles says, that with MW sniper xbow you still really often have to shot 2 times at 1 person. But I have only not heirloomed sniper xbow, so ask him yourself.
Hmmm ok, if I see him I'll try to aks him
I get rather common 1 shot on my HA with 52 body armor in total..without any IF.
But anyway..not wanting hurt someone really bad but expecting to 1 shot people is rather greedy..
I know I'll never be able to one shot mail or above, its just that for the time it takes even at 150 WPF to reload the sniper xbow I find it stupid that I can't one shot light armor such as the sarranid leather armor (28 body armor). I know this one guy that is pure archer (so no IF) and with that armor, I would need 2 bolts in the torso to kill him! And it happens pretty much all the time, whenever I managed a good sniping shot in the torso of an archer, he was still alive! I use a modified loud sound to make sure to hear whenever I land a succesfull shot and I sure hit him. I completly understand that I can't 1-shot melee guys that have IF on top of medium+ armor but leather armor? Comon!
Edit: oh and if ur getting one shotted while on your horse it's probably cuz you were at high speed toward where the projectil came from which gives a damage bonus. On the other side, if your going in the same direction as the projectil (get shot in your back while running full speed), you get less damage. Somebody plz correct me if I'm wrong.