My Guess would be Model 2 Double action revolver.
Price would be $150-200 in excellent condition.
That would be a Black Powder cartridge but if you had the brass I would think there would be a load suitable to be fired in yours.
For the message of the Cross is foolishness to those who are perishing, But to us who are being saved, It Is The Power Of God. 1Corinthians 1-18