I have a couple of 22 Hornets as well. One is built on a small Martini action with a 1 inch barrel. It shoot one hole groups out to 50 yards. (one cm). The other is a Winchester model 43, bolt action that is almost as accurate. It is death on Rocky Mountain Jack Rabbits out to 150 yards. The 22 wrm is fine to 100 but definitely drops off pretty quickly from there. The Hornet, as mentioned is much quieter than the 223, which is important when hunting rabbits.
Crows are very difficult to shoot in quantity. They have incredible sight and hearing. This summer we were inundated by Crows. Hundreds of them. They came for the water. Our summer was bone dry and the year round creek attracted all sorts of birds and animals that we hadn't even known were in the area. To many Crows are devastating to the songbird population, so they needed to be whittled down.
The 223 was to loud and they quickly associated the noise and would leave for a few days, especially if one of the dead ones was left dangling in a visible tree. The 22 wrm just didn't quite have the range. Once they were alerted, they definitely had an established safe distance that they would gather and squawk at. The 22 Hornet was the perfect choice for them.
As for brass stretching, the 22 Hornet is one I don't anneal. I also don't size the cases unless it's absolutely necessary. I find that cast lead bullets of around 40 grains.225 fit snug enough into necks that all I have to do is replace the primers, add the right amount of powder and seat the bullets. Yes, they will move if I'm to aggressive. No, this won't work with jacketed bullets.
The Martini doesn't care and I don't have any issues to chamber a round. The Winchester on the other hand feeds from a magazine, so care must be taken when stripping a cartridge from the mag to the chamber.
There seems to be a lot of Hornet cases and factory loads at gun shows lately. I'm lucky in that our local shop carries it regularly. Still, it isn't cheap. It's about half again as much as 22wrm.