I have several... & actually will be chambering 2 of my guns into 22 K Hornets, which are supposed to offer a bit more velocity ( not necessarily what I'm after ) a little better accuracy, & longer brass life...
the ones I'll be chambering in K Hornet are a pair of fast twist customs ( in in 9" twist instead of the standard 1 in 12 or 1 in 14" twist )
it's a fun round, with acceptable accuracy ( I've had trouble getting exceptional accuracy, hence the switch on 2 of them to the K Hornet )... the K Hornet straightens the long tapered case, offers a distinct shoulder, in many ways looks like a mini 223, it takes special dies to reload, but firing factory rounds in the K chamber fire forms the cases, & still offers acceptable accuracy when fire forming, so nothing is wasted