Ah, the joys of black powder shooting. The muzzle loading community is not immune to government intrusion. Cap and flintlock guns have tripled in price. Powder its self has gone up 4x in price. Powder storage is regulated by the International Fire Code. There are a couple of cities in Washington that require you to sign for powder. That goes to the local fire marshal and your home may be inspected for proper storage. But, then you might already know this if you work for the fire dept.
But check out,
Here is a nice little pistol that makes a good sidearm,
Also be sure to check out local ml clubs in your area.