I know RMCA did test for an LP10 and the RWS R10 7gr 4.49mm came out best. The RWS Diablo basic also came out well, considering they are a lot cheaper (although not through the same hole).
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I did a test with RWS Basic in a LP1. It was a thirty shot group that would BARELY cut the line of the "11" ring. Yes we have no crap flyers.
redone the test in my P8X with the RWS Club pellets from a different box. same good result: https://youtu.be/HKescsQ2McU
also shot over a chrono to mark speed consistency
Airpistol: Feinwerkbau P8X
STP: Pardini SP
CFP: Pardini HP
Freepistol: TOZ-35
PPC: CZ Shadow 2
PCC: Nova Modul CTS9
BR50: CZ 457 LRP