.177 caliber airgun pellets have a great reputation for accuracy and consistency among serious airgun shooters. You’ll see them being used by many serious Field Target competitors, for example.
Surprisingly, they’re also not expensive! Just 2.8 cents each compared to the mean price for .177 cal lead airgun pellets of 2.7 cents each. And – of course – cheaper than that if you buy four tins from Pyramyd Air or Airgun Depot and get one for free.