The old gun may not hold up for long under the extra pressure of the 22 mag round. You do not want to be picking pieces of the colt or action out of your face. Have seen several older 22's that have been converted to 22 mag, and it was when the owner or a lawyer wanted to sue the manufacturer after the gun came apart. Your gun might be strong enough and never have a problem, but is it worth risking an eye or two?
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