I had a bottle of air venturi BB's nearby so I just used those and my new 499b does fine with them.Now I'm etting ready to see what it will do with standard daisy BB's.
Avanti BBs on sail at PA:https://www.pyramydair.com/product/daisy-match-grade-avanti-precision-ground-shot-177-cal-5-1-grains?p=398