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You can shoot BB caps, CB caps, .22 short, .22 long, and .22 long rifle in the long rifle cylinder. Swapping out the long rifle cylinder for the .22 magnum cylinder, you can shoot .22 Remington Special, and .22 magnum. You could also fire .17 HMRF, but it wouldn't be the least bit accurate as you would be shooting a .177 cal bullet in a .219 barrel.