"Might be easier and cheaper to re-barrel the 458 to 45-70"

I've got a #1 45-70 barrel you can have for $60.00. I've had it more than 20 years and just dug it out of a cabinet when I saw this post. It had been perfect the last time I looked at but now it's got/had a few spots of surface rust on the exterior. I rubbed them off with some Remoil and a plastic cleaning tool. Dern SC humidity!! The rear sight is missing, but otherwise in fine shape.