Done a bit of testing with my very early HW45....

Milbro Match 7.7gr........av. 5.08 ft/lb
RWS Super H point 7.28gr......av. 4.94 ft/lb
RWS Hobby 7.1gr........av. 4.92 ft/lb
Eley Wasp 7.35gr......av. 4.73 ft/lb
Bisley Magnum 10.46gr.....av. 4.08 ft/lb
RWS Supermag 9.3gr......av. 3.89 ft/lb
H&N Rabbit Magnum 16.8gr.....av. 1.73 ft/lb

The RWS Supermag's are a surprise - I expected them to do well
The Milbro Match were amazingly consistant with only 4 fps variation over 5 shots!
This particular gun shoots tights groups and most smoothly with RWS Hobby although I will try the Milbro pellets at some point now.....