I have a stainless 983S Marlin 22 Mag tube magazine bolt action rifle. It is a nice gun.
Very accurate. It is nice having 10 rounds on hand when you need them. I have never
had any trouble with it. That being said I would like to get a 22 Mag barrel for my
Sportster. I'm sure it would be just as accurate and a heck of a lot cheaper. Being
that the H&R is a single shot it wouldn't tempt me to shoot a bunch of expensive
22 Mags rapid fire like I do sometimes with my 983S. I can't help it. It's too much
fun!

Seriously though, I have 17 HMR and 17 M2 barrels for my Sportster. Both
of them will shoot 1" or less at 100 yards if there is no wind. I don't see the 22 Mag
being any less accurate. It also wouldn't be as wind sensitive as the 17's.
Robert