Try buying a couple of small boxes of which ever ammo is available in your area. See which one seems to work the best in your particular rifle. As stated before some rifles like some ammo better than others. Personally my rifle has done fantastic so far with Federal bulk pack, Remington sub sonic, CCI Blazers, CCI Mini Mags, CCI sub sonic, and Aguila Super Extra(funky smelling)(yellow and blue box, 38 grain)