Most .17HMR's use the same magazine as the .22 MAg. I would expect your 452 to be no different.
: Savage and Marlin both sell the same mag for both rifles. I think CZ?BRNO does as well.
: I think you're going to really like that Hummer. I have one on a BSA Martini & with the Green Mountain barrel, shoots 1/2" and under for 5shots at 100meters.
: We use them for ground squirrels here, out to 240yards. Chest shots or head shots are necessary beyond 175yards, but kill these rodents, they do.
: Mil dot scopes really are nice, with the extra POI dots. I use a 6.5-20X scope on mine. See every hit - vividly.
: Be lots of fun on rabbits!