Well I see Winchester has now brought out the “.21 Sharp” ( basically a .22 LR worded with a sub caliber bullet seated inside the case. ). Frankly I can’t see this doing anything that an existing rimfire doesn’t already do. IMHO this is yet one more cartridge introduced to sell more rifles with higher priced ammunition. I can’t see this doing anything a .22 LR, a .22 WMR or a .17 HMR can’t already do equally well except help drain shooter’s pockets of $$. In the last decade or two there have a ton of “new” rounds introduced (most of which have disappeared since leaving owners of firearms chambered for them struggling to find and paying through the nose for ammunition. I’m all for development and advancement BUT “new” should be “improved” in some significant way. One of the few nee rounds to succeed is the 6.5 Creedmore-it’s great and popular BUT it really won’t do anything that ancient 6.5 X 55 Swede or a .264 Win Mag won’t do, albeit using a shorter case. Realistically nothing really “new” ballistically has came along in a LONG time. Metallic case ammo has been around a long time, and there’s been a ton of development over the decades, so there are few, if any, truly”new” opportunities. The laws of physics haven’t changed
(‘Course the recoil’s probably be too much for an old man, so make mine gas operated). Oh, and it’s needs to be under 20 Oz and sized like a Hellcat
