Cast iron has been used to make many firearms. It was not until c.1850 that steel came into use and even then it was not in common use for many years, wrought iron being the gun material of choice for firearms until the advent of smokless powder c. 1900.
To be honest, I would consider that rifle a part of my family heritage and give it a well-earned retirement to a display case. If you want a shooting gun, there are plenty of good .22's around that will do a better job and with no risk.
Jim
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