These are the pellets that work best for me, very accurate and deadly on small critters and Magpies lol
Air Arms Diabolo Field Heavy 10.3 g.
A few Pictures:
1st picture was a 2 1/2" diameter target at if memory serves @ 20 yards, the other pictures are comparisons of other pellets I have tried. When I bought my .177 to get rid of a Magpie Infestation, I tried a total of 6 different brands the Air Arms were by far the most accurate out of my rifle.