Which ammo is better to use in your 15-22 is a never ending topic just like which is Better - Chevy, Dodge or Ford!
I use Winchester Ammo in my 15-22 and it runs great! Initially I had a problem with FTE and had about 9 or 10 stove pipes per magazine but found out that the Ejector was not adjusted correctly, learned that through reading threads here and how to fix it. I had to bend it up a little and now it works just fine. Last time at the range I ran 475 rounds through it and it was wanting more! Not one stove pipe!
I also purchased a McFadden Machine Loader to load the magazines. The magazines are very sensitive on how you load them. The rounds have to be staggered just right. Also makes loading the magazines a breeze. Can load 25 rounds in about 1 minute or less. Really saves the finger tips!
Recommend you get one of these.