IZH-46M (what pellets?)

I have the earlier Non-"M" version, IZH-46. I have tried both heavy and light Meisterkugelns, and the lighter 7.0 ones worked better for me than the 8.2 ones. That said, it's splitting hairs and could just be good day/bad day bias.
I'm shooting the Diabolo Basic 7.0 because they're less expensive and I can't see any difference.
Note, this is all shooting 10 meter standing with one hand. If you are benching or using a different sight, YMMV.
 
agreed , Quality wad cutters , Eley makes Olympic grade : tenex is a bit of $$ but tenex also has a practice grade Ventus .https://www.killoughshootingsports.com/159-air-pellets