The following video from Savage Arms highlights the mechanical features and function of the all new A17 semi-automatic rimfire rifle chambered for the .17 HMR cartridge.
While the new A17 rifle is designed to function with all 17 HMR ammunition, some older ammunition may cause reliability problems in extreme conditions. A few years ago CCI (who manufacturers all brands and variations of the 17 HMR ammunition currently on the market) changed to using a new powder for the 17 HMR ammunition. This new powder resulted in a higher chamber pressure and different pressure curve and dwell time than the previously used powder. The A17 is designed to function properly with the newer, higher pressure 17 HMR ammunition, but should also cycle the older lower pressure loads as well so long as the ammunition is in good condition (clean, no build-up, no dents, etc) and has been stored properly (storage in hot areas for long periods of time can cause the necks to crack when fired).