Old West Sourcebooks?

[Xplo]

Originally Posted by Dunadin777

So, books I should probably pick up: GURPS Tactical Shooting, GURPS Old West, the Knuckleduster books, and maybe Thaumatology/Deadlands for the secondary elements.

If there's not going to be any magic, or at least none that the PCs will be using on a regular basis, you don't really need Thaumatology for anything. You certainly don't need it to invent zombies, rituals, or magic McGuffins.

OTOH, I strongly recommend High-Tech if you don't already have it for TL5-6 guns and equipment.