Each barrel and be different remyd, as can each batch of pellets. I found RWS Superfields in .22 produce too many flyers for my HW100, whether this was because the batch, or my barrel I don't know. Best to try another couple of different pellet types. I'd reccomend Weihrauch's own brand of pellets: Wehirauch Field and Target Special, or JSB Exacts. With regards to the chrono, the HW100's are amazingly consistant as they are regulated. Mine shoots flat from 200 down to 90 Bar (the green zone) with a maximum spread of no more than 10ft/sec over a full string