I have gone with what The Doctor says i.e. the test group that came with my LP10 stated 4.49 so thats what I went with. I shoot JSM Match Diabolos (yellow) and I am improving slowly (particularly enjoying 20 yard at the moment). I don't think I'm at the stage where a different pellet would make much difference - but I could be, and often am, wrong

Any luck with your hunt for the elusive Model 40??

Cheers

Mark