I think 300 Mag is right. I had the 39A from back in the early 80's and didn't really need a 9422. But, my Dad had a 9422 and when I'd go visit the parents, he'd put me on armadillo/skunk/squirrel patrol with his scoped 9422. Didn't take long for me to really get fond of the rifle, so when I saw one cheaply priced, I was all over it.
I think that if I had to make a special shot at 50 yards or so, I'd be a little more confident making the shot with the 39A. If I had to walk the fencelines on the ranch and tote a 22 rifle, I'd go for the 9422 first.