22 mag ammo is way too costly. Since you can't reload it, just buy whatever you can find that is the cheapest. Then load up on it if its on sale.
I have a buddy who bought one of the 22 mag semi-auto's. It couldn't feed a full magazine of ammo without a jam no matter what you did. We finally went out and bought one box of every brand/bullet style/bullet weight we could find. I went in halves with him and got to keep all the unused ammo. These days I've only got a 351, so my hearing isn't so good anymore.
You can do the usual stunt and take the different ammo samples you find to the range and test fire it at paper. Some really does seem to be more accurate than others, and some seems to be less dirty (but its all dirty.) It won't change your conclusion one bit. Buy the cheapest and live with it. Its still cheaper than shooting any factory centerfire ammo. But it won't compare with your own handloads.
OH, what to try a cool trick? Pick up your empties. Take them home and some evening when you've got nothing else to do, file, saw or cut the rims off them. Then fit them with 22 lr ammo. The thin ones work kind of good and form an adapter to fire 22lr in 22 mag guns! Not real accurate, but less noisy and worlds cheaper!
