Indeed, the RWS Diabolo 'Squirrel' brand green tin pellets were excellent in a variety of airguns back in the 80s.
I did buy some RWS Meisterkugeln from JSR a while ago, but they are out of stock today.
The Wolfman has some in stock >>>>>> RWS Meisterkugeln .22 Pellets | Wolfman (thewolfman.co.uk) <<<<<<