That pistol looks like the CVA mountain pistol.. It was the mate to their Mountain rifle of the same caliber.
25 years ago, you could buy that as completed gun or a kit.
The completed one was around $100 as I recall, and the kit was about half that.
The pistol was made out of the same parts as their 50 Caliber rifles. I was given the kit and built it into a plumb fun gun..
I had it for years and traded it for something I don't remember and probably regret.
I can tell you I ran across an Angus bull that had been killed by lightning on the ranch.. Just out of curiosity, I decided to see what that pistol would do on real meat..
With a charge of around 50 grains or so that rascal put the ball clear through that 1800 pound bull carcass..
The gun is accurate and powerful enough to deserve a lot of respect.
My wife had a CVA Mountain rifle and delighted in outshooting the guys with 600 to 800 dollar custom front loaders on a regular basis.. You have a very viable pistol there.
Have fun
BTW don't start out with 50 grains of powder... Try 30 and work up!!!