Quick Question - rules for heavy bows

[Varyon]

Originally Posted by Donny Brook

Where are the rules that say how much a higher than listed ST for a bow affects its damage?

They make it fairly clear that you only use the bow's ST for damage and range, so using having higher ST than the bow requires results in a bow that functions exactly like it would for someone who exactly matched its ST. Strongbow doesn't make any bow you pick up somehow stronger (although Weapon Master arguably does), rather it means you can use a stronger bow. So if you have Bow at sufficient level to get +2 ST from Strongbow, and you have ST 12 to start with, you can use up to an ST 14 bow.

As for exactly what effect using an ST 14 bow has over using an ST 12 one, a longbow for example deals thr+2 imp and has Range x15/x20. So an ST 14 bow does 1d+2 imp and has Range 210/280, while an ST 12 one only deals thr+1 imp and has Range 180/240.