Has anyone tried the .22 Skenco Newboy Senior 28.6 gr domed pellets?

I'm looking for a extra heavy .22 pellet for my 40 ft/lb .22 DayState Air Wolf. So far, I've shot the Eun Jin 28.4 domed pellets which were very accurate and hard hitting though too greasy and dirty. I have also tried both the JSB Monster and JSB Straton 25.29 gr pellets but neither grouped well out of my rifle. Now I'm looking at the Skenco NewBoy Senior 28.6 gr domed pellets as an alternative.

Has anyone tried the Newboy Seniors and if so, what were your thoughts and how did the perform?

Thanks,
Scott