Spokane and Spencers, BP, Percussion Pistols, etc.

[geo]

We are planning to move to Spokane, Washington from Maryland in a couple of years (those of you who live in Maryland know why.  I want to see how the BRAC plays out first before listing my house). Any leads on places, ranges, groups friendly to Spencers, black powder, percussion pistol shooters? thanks in advance, geo.