It will be interesting to see what kind of loads and projectiles it shoots. Keep us posted. As for $50.00 for a rifle, just to have it around to look at it is worth that.
I never shot a Rossi muzzleloader, but when I was kid, Dad's friend had a pump Rossi .22 rifle that was just deadly accurate on squirrels and rabbits. It too was a light weight short little rifle (lost in a fire). Was easy to carry, well balanced, and had a good trigger. They used to let me shoot/use it, and I was a whirlwind on squirrels & rabbits if they turned me loose with it.