Can I fire fine silver findings with a torch?

Yes, absolutely. When it comes to metal clay and findings, the main benefit of using fine silver findings over sterling is that they don't oxidise when fired at high temperatures.

This means you don't have to worry about firescale, which would turn the finding black and could also cause adherence problem. A few people have told me they're worried they might melt the finding - don't worry, if you heat the piece enough to melt the fine silver finding, you will also have melted your silver clay piece into a blob!