So Jagex released the new Amethyst items as an expansion to the Mining Guild. Part of what these make is a new type of arrow which can be used with any bow.
The 49-55 Ranged Strength difference over a rune arrow equals +1 to the max hit of a rune arrow, pretty interesting stuff and will be the new ammunition for BiS MSB pking.
MSB + A Arrows : Max hit 25, fires at interval 6, 2.4 seconds DPS: 10.41
MSB + R ARROWS : Max hit 24. fires at interval 6, 2.4 seconds DPS : 10
CRYSTAL BOW 100% : Max hit 28, fires at interval 5, 3 seconds DPS: 9.33
Fairly significant DPS increase for what will most likely become an almost negligible difference in cost without making the bow too overpowered, of course, these stats are based on nothing more than the ammunition ranged strength and have no extra bonuses such as void or anguish.