Not sure about Line J saying "Excluding 22 Rimfire"

Plenty of Rook rifles made originally in 22LR, I have one myself. There are a number of guys in the club that have Rook rifles originally chambered in 22 including a very nice Jeffery and a H&H. One of the guys has a magnificent H&H top lever Rook rifle in 22 Hornet and it is the original Cambering.

Matt.