So silver bolts and arrows are better than steel ones? Oh.
After a bit of testing an theorizing, the community generally accepts that heavier bolts are better. You probably won't notice the actual effective difference between silver and steel bolts without deliberate testing.
IMO, steel bolts are a bit of a waste of resources unless you have several layers with magnetite.
Nope, bolts use the EDGE tag which means metals which are better for edged weapons are better for bolts. Silver bolts are worse than copper bolts which are worse than iron bolts etc.
Silver bolts if and when they get blocked by armor become a blunt attack and
may break bones under the armor. However whether this is better or worse than a steel bolt piercing straight through and tearing apart the spleen is largely opinion. Since goblins tend to have very little armor in the first place this is even less of an issue.
However, in vanilla bolts have a max speed so bolts like adamantine are not plausible because they will reach this speed very quickly and they will be just as effective as an iron bolt.
Generally the best material to worst materials are
Steel, Copper, Iron/Silver, Wood/Bone
I consider copper the best as it is more time consuming to make, and has both a high density and a decent piercing ability. But opinions opinions.
Quality of both crossbow and ammo has an effect as well.
Here's the
'Community Testing and theorizing' behind this claim.