I don't know when this was changed, but in p22 it seems like arrows/quarrels get destroyed much more often (probably with the special message "your -foo- is destroyed upon impact!" which gets absolutely ridiculous when you miss the monster). I don't whether this was intended as a nerf to slaying ammunition, but right now it makes using it extremely unreliable in comparison to previous versions which seems like a further imbalancing towards magic-oriented characters.