Astlin said:
Ok, I am looking at DR.
Even if you do 9.5 point of damage, you are not getting past DR10/+x. Even at a max damage of 13 (1d8+5 at Str20+), you are only going to get 3 points through.
Or, maybe:
Point Blank Range: +1
Weapon Specialization: +2
Ring of Might: +5
where you have to roll a 3 on a D8 to do damage with the Ring of Might as opposed to rolling an 8 on a D8 without the Ring of Might.
If you are out of magic arrows, it very difficult to do any damage and then, typically a maximum of one (unless you have a feat outside of core rules or a magical mighty bow).
Granted, this feat set (which is fairly typical for archers) combined with a Ring of Might and some Strength boosting magic would result in at best 2.5 points of damage on average, 6 points of damage maximum as compared to 0.125 points of damage average, 1 point of damage maximum without the ring.
However, without the Ring of Might, a bow critical (with the feats above) averages 5 points of damage and has a maximum of 12 points of damage against a DR 10/+x opponent. With the Ring of Might (at full +5), a bow critical averages 15 points of damage and has a maximum of 22 points of damage against the same opponent.
Effectively, the ring (at full +5) more than triples average damage against DR 10/+X opponents.
Astlin said:
You are still going to be using magic arrows to damage folks with DR.
We have two archers in my campaign, both of whom would rather use magical melee weapons against DR opponents as opposed to using up their magic arrows. Every archer-type character I've ever seen does this: use magic arrows only when extremely necessary. Maybe your experience is different and your archers use magic arrows every time they face a DR opponent, but I seriously doubt that this is the status quo for most players.
Even with a magic arrow, you are often coming close to doubling arrow damage with this item (even a +5 magic arrow increases damage on average by over 50%).
Side Note: Compare this to Bracers of Archery at +2 to hit, +1 damage and only within 30 feet at 5100 GP. Even Bracers of Archery does not help much (and not at all beyond 30 feet) against DR like the Ring of Might would. Nor does Bracers of Archery help out in general as much as the Ring of Might.