theres a chart for xp per gp used in construction, is there a similar chart for arrows used? like a rune arrow costs more than mith for example but since your max hit increases the cost per xp is similar

That depends on the damage you inflict, which varies a lot depending on ranged level + ranged strength bonus (+ extra bonuses, if any, such as boss XP bonuses) + extra variance when counting boosts depending on current boost status. It's a lot more difficult to estimate costs for something like that and definitely can't be expressed using a simple chart since it's nonlinear.