A friend of mine has been a big 5.7 fan since they pretty much came out. I've seen him nake some nice longer range shots on rabbits etc with his pistol.
I haven't gone that route because I've heard it's difficult to load for. Something about a proprietary coating on the cases that wears off and then they don't function well. Plus they are very sensitive to charge weights. I wish there was a similar round that was more reloader friendly. I can get the charge weights right I just don't want to deal with the coating issue. I've also looked at rock islands little 22 round with interest but I don't like the bullet limitations. I'd like to be able to load 40g vmaxes. I've wondered about necking down a 30 supper carry case to .224 but I'm sure it's a project not worth my efforts. Although I've often thought a revolver in 22 k hornet would be fun. Like a 22 mag without the heavy rimfire hammer and trigger.
Bb
