What to stay away from:
Eley Grand Prix 26.5gm V2m 390m/s P 536bar
Eley VIP 28gm V2m 390m/s P 560bar
Hull 'Three Crowns' fibre wad 26.6gm V2m 370m/s P 577
" " Gualandi plastic wad V2m 380m/s P 614bar
Viri 28gm V2m 385m/s P 650bar
These are excellent CIP rated loads, but you can't use them.
You need to use 2&1/2" trainer weaklings from RST or Polywad.