Just got back from GM. I got both the .22LR and WMR cylinders for $179.00.
Great price.Mine was right around $200 with both cylinders, nylon holster, ans wooden Civil War display box a couple years ago.
As far as the +V ammo I think they reach the higher velocity via a lighter bullet. I'm not sure if the chamber pressure is any higher. As I said earlier I very seldom use the magnum cylinder because for my use I see no advantage of shooting the much higher priced ammo. Good quality Long rifle does jut fine. In fact, even the cheap-o Remington Golden Bbullet bulk 550 boxes from Wally World shoot great!(bottom, right)
(others top left clockwise Aguila Super Max, CCI Velocitor, RGB, and Federal American eagle)