If someone gave me the silver required I could certainly cast a few bullets. Silver melts at 960 Celsius, thats close to the max temp what my electric melting furnace can reach (remember, lead melts around 400 Celsius), but it would work.
Though you should be aware of silvers brittleness. Silver is not an ideal bullet material and may break apart inside the barrel when it gets squished through the forcing cone at blistering speed, let alone properly engaging the rifling and make it spin. A silver projectile would probably start to tumble a few meters after leaving the barrel due to the damage and the lack of gyroscopic stabilization.
I think shotgun pellets with a plastic shot cup and wad to soften the acceleration would work better.
Gold would work much better, its soft enough, very dense, it would probably stabilize and fly true. $$$ though. Remember, one shot would send 32-42 grams of Gold into the bullet backstop. (Thats an ounce per shot, thats about € 900 per shot, or 720 BP )
If I was rich I'd totally do it though.