There is no restriction on the possession of 'prohibited ammunition' for 'bona fide cartridge collectors', and shot cartridges for rifled firearms are not prohibited. The 'multi-projectile' classification is for multiple projectiles of bore diameter and the law gives 'duplex loads' as an example. The wording is poorly written (and conceived) but the meaning is clarified by the reference to duplex loads, and the specific exemption for shotgun cartridges. When you fire shot cartridges in a rifle it becomes a 'shotgun', albeit of dubious usefulness.
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