If accuracy is your thing then domed pellets are the best from what I've found. In my 97K and prosport the QYS 8.48 has produced 1/4" 5 shot groups at 40 yards, they're around $20 a tin. Although the average is 1/2" or under at 40 yards.
The JSB 8.44 used to be my favorite, but they also used to fit in the bore better than the recent ones I've bought. I have 4.52 and 4.53's on hand. It really comes down to your rifle and how well the pellets fit your particular bore. A loose fitting pellet usually produces a flyer, while a snug, (won't fall out of the breech on it's own) usually shoots more accurate. That said some other pellets that shot well out of my rifles are....H&N FTT 8.64, JSB 7.87, JSB 7.33, H&N sniper medium 8.5, crosman premier brown box 7.9, beeman field target 8.64, AA 8.44. But I don't shoot these..lol.
QYS 8.48 or JSB 8.44 are the pellets I shoot in my rifles. You just have to do a lot of testing and start with a clean barrel to eliminate that variable,
and test when there's no wind.