I love the little .360 doubles. They are rare, fun to shoot, effective, and so tiny.
I have a dandy little Rigby made in 1880:
If you want to see it all gutted out when I first stripped, cleaned, and lubricated it, go here:
http://rbsiii.com/collection/rifles/Rigby_360_15093/(The photos above were taken after re-assembly.)
If you ever own one of these you will know the unique pleasure. Ballistics are nothing to sneeze at - about the same as a .38-55, but with a lighter "express" bullet. Mine regulates with 200 grain bullets. Brass is no problem. Buy a batch of 9.3x72R and chop them to proper length.
Yes I love double rifles. Those with back actions and hammers are sublime:
Curl