Some more pellet choices for .177,just some info.

My FWB 300S shoots these FX pellets hole in hole. I’ve heard they are made by JSB but I’ve found them to be better quality honestly. They are diablos. H&N Finale Match Heavy are wad cutters as are the RWS Meisterkugeln. The 300s shoots them hole in hole as well.
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My HW50 ,R-9, and CZ634, among others, like the JSB Match Diabolo 8.44,will I just shot the JSB Match Diabolo 8.02 gr. through them, and they like it better.The 8.44 is dome head, and the 8.02 is flat head. Have any of you had similar results?
I can attest to Diablo Exact pellet accuracy. I use

JSB Diabolo Exact Jumbo Heavy .22 Cal, 18.13 gr​

Not .177 but I cant imagine they would be TOO much different maybe the .177s are even more accurate if thats possible. I stack these on top of each other in the same hole its ridiculous.
 
I can attest to Diablo Exact pellet accuracy. I use

JSB Diabolo Exact Jumbo Heavy .22 Cal, 18.13 gr​

Not .177 but I cant imagine they would be TOO much different maybe the .177s are even more accurate if thats possible. I stack these on top of each other in the same hole its ridiculous.
You switched calibers on me, there can be a big difference in .177. If you can shoot well enough, you will see it. Each rifle is different. I'm glad you found the best one for your .22. (y)Some of my .22s, like the Falcon 13.43, . I think the .22 is less particular, anyway; that is my experience.(y)
Fair enough. Id just find a manufacturer that is known to have consistent quality, get a few different weights 4 groups of 5 with each to cover any variables and go from there. Thats just me. Also I did notice a huge improvement in accuracy when I gave the barrel a very careful but uniform polish using 4 mops and J&B bore cleaning compound. You have to be very careful obviously, there is a video of a champion marksman shooter on youtube that covers this process exactly. Was already an accurate rifle but it took the group from a half inch at 40 yards to stacking pellets. Plus its far easier to clean now. I wish I could help more but its worth a look.