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It functions (you do not have to cycle the bolt) with all 3 short long and LR that is one of the selling point on this rifle.
From Remington page Now in its 50th year of production, the lightning-quick Model 552 BDL Speedmaster is the only American-made 22 autoloader that handles 22 short, long and long rifle cartridges interchangeably. Like its pump-action counterpart, it features adjustable big-game sights, positive cross-bolt safety and a grooved receiver for scope mounts remington.com/rifles/rimfire/model-552-speedmaster/model-552-bdl-speedmaster

No manual cycling needed on this one William! The Model 552 BDL Speedmaster is the only American made 22 autoloader that handles 22 short, 22 long, and 22 long rifle cartridges interchangeably. Holds (15 round capacity .22 Long Rifle), (17 round capacity .22 Long) and 20 round capacity .22 Short.