I had a Bianchi holster for mine but sold it since I can't remember ever using it. It's one of the few guns I don't think I would carry. The only reason I bought the Bianchi is because I figured I would use it at the Range - never did.
The only time I carry a 22LR in the Field (M63)is when I am Pheasant Hunting with shotgun in hand. In Bear territory, that 22 becomes a 3' M65 357 Mag with 180 Gr. Buffalo Bore hard cast Mag's.