I want to shoot this Whitney Kennedy light frame...but
It was my dad's. He got it from his dad. It is a partial octagonal .38-40. Its bore is very bright, but the receiver is full of old powder residue, dried grease, and general crud. Once it's cleaned out, lubed and reassembled, I don't want to have to take it apart every time I shoot it, but it is a black-powder cartridge rifle, so it'll get crudded up fast.
Does anyone know if any of the newer BP substitutes (like Blackhorn 209 or Black MZ) can safely and reliably be used in that cartridge without over-pressuring the gun?
I'll have to take new pictures at lower resolution; the current photo files are too big to upload.
Old MilSurp: 'Great hobby for a retired history teacher!