Not all Ruger 10/22 magazines are interchangeable. The owners manual for the 10/22 Magnum model states, "Do not attempt to use standard 10/22 magazines in the 10/22 Magnum rifles or load .22 Short, Long, or Long Rifle ammunition into the .22 Magnum. They will not function correctly and are unsafe to use in .22 Magnum rifles." It goes on to say, "Never attempt to use .22 Long Rifle ammunition in Ruger 10/22 Magnum rifle magazines. The cartridges have a smaller case diameter and can split or burst when fired in the larger magnum chamber, releasing hot powder gasses and particle fragments out of the action at high speed, possibly resulting in injury to the shooter or bystanders."