See: The vampire weapon at the National Firearms Museum
Presently… accepting this inquiry emerged from the "Solitary Ranger" mythos…
No.
The Lone Ranger proved unable, in any sense, smelt and cast metallic silver into shots over a pit fire in a relinquished silver mine. Silver melts at 931c or 1763f. No open air fire can do that (OTOH, I have dissolved and thrown LEAD over a pit fire. Lead liquefies at 327c/621f. that is simple over a decent bed of coals… )
Additionally, Silver is too difficult to even consider using in a rifled gun without making harm the drag
