That’s correct, yes. Mundane attacks hit automatically and you only roll for damage rather than to hit. This is one of the core rules from Into the Odd and Cairn, which We Deal in Lead is based on. I’ll investigate adding a line into the combat section for clarification. Thank you!
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).