From the naming page
Naming a weapon increases to-hit enchantment by 3% (rounding up) and damage enchantment by 150.
Does that mean if i name an arrow it adds 150 to the X?
Normal x1 Seekers VRS 0 AC no prot target, using x1 compound bow Cephas Keken Maug Fighter shot Booni [29955] Cephas Keken Maug Fighter hit Booni [26207] Cephas Keken Maug Fighter shot Booni [29241] Cephas Keken Maug Fighter shot Booni [23409] After Merging with my named seekers Cephas Keken Maug Fighter hit Booni [132110] Cephas Keken Maug Fighter shot Booni [112157] Cephas Keken Maug Fighter hit Booni [131413] Cephas Keken Maug Fighter hit Booni [135066] So that preety much says that naming ammo does likely make it x150 ammo.