Looks like you have one of these..https://tinyurl.com/yxn7lzor
I have it's "Big Brother," the three band. Are there any markings anywhere on it?
Don't use smokeless powder or FFFg. the first will blow your barrel apart at least and the second is too "hot"( fast burning.)
FFg is my recommendation, GOEX or Hodgdons and I suspect it takes the "Top Hap" caps.
My current first port of call for consumables is www.beavergrease.co.nz
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