Hi just thought I'd add to this post, I haven't seen weihrauch F&T Pellets mentioned. I bought a tin from Tonys camo and they're fantastic in my HW97K, Haven't seem them for sale anywere else.Only £4 for 200.
RWS Superfield are also very good,
My choice of hunting pellet is also RWS Super H Point.
Just purchased some Prometheus to give them a bash, you don't know until you've tried eh? Lot of poor reviews though
Might try the Weihrauch Magnums next, has anybody tried them?