After reading the book again, (if I am reading it right) it seems odd that Mundane Weapons always hit. Is this correct? If so, this is never explicitly stated that this is the case.
Viewing post in We Deal in Lead Readthrough
Since this is the case, it would seem that it is better to carry a mundane bow and arrow for shooting most things and only use Artefact Guns only when dueling another gunslinger since Artefact Guns can miss.
Also are there guns that are not Artefact Guns? If so, it seems that it would be better to use a mundane gun than an Artefact Gun (I know Artefact Guns have special abilities to try to make up for this but those do not seem good enough to make up for a 50% chance of missing).