Can't speak to the Magnum Research product, but having had the Smith 22WMR since it's release, I feel confident in my comments on it.
Initially, I couldn't get 3 rounds in a row out of it without a misfeed, a stovepipe, or a failure to go into battery. I followed their recommendation and used only 30/50 grain CCI, Fiocchi, Hornady, and Speer ammo. It made no difference whether mixed in the mag or all one brand.
I didn't load 30. Always stopped at 25 rounds. I almost wanted to trash the pistol! Even contacted S&W Service about a return or replacement. All the glowing reports from reviewers had me very perplexed. Was this a fluke or a normal occurrance?
I guess I got an honest tech when I called. After a long conversation, I was told to send it back if I wanted. I was not the first to complain on it. However he did suggest that if I like the idea of the pistol...invest a bit more time and a lot more money in ammo for it. Also start at 15 rounds and slowly work up on the number of rounds in the mags.
I did that. Second 300 rounds saw a bit of a change in feeding from the mag. Didn't get above 20 loaded until I finished those. I have between 700-800 rounds thru mine now and it has gotten more reliable. Still don't load more than 25 in the mags. I'm using ONLY 40 grain jacketed ammo, and pretty much Fiocchi and Hornady. Feeding is better. Still the occassional stovepipe, and still usually at least once a mag the slide will be slightly out of battery. A light tap normally cures it.
I do feel better about it now. Enough so that I'm keeping it and plan on a little time with some flitz cloth on suspect surfaces. It is fun to shoot, and it is better than the Keltec 22 WMR. LOL!
But...if you want a dependable, fun to shoot, and a good trigger...buy a Walther! Yes, I really think it's a much better pistol than the Smith if you want a 22 Magnum shooter. Walther recommends 30 grain and above, no polymer tip bullets, and absolutely no Agulia.
My personal preference just for fun shooting is Fiocchi 40 grain. If for serious work, Speer Gold Dot 40 or CCI Maxi 45 grain segemented rounds.
I may yet decide to let go of the Smith. I'm that pleased with the Walther. Good luck with yours.