Hello, thought I would have 1 last try aand ignore the setting up advise for the Huma regulator, the advise is that the 3mm. grub screw should be screwed in as far a it will go and then backed off 2 turns, well I simply wound it out until it was showing just proud of the surface ( which is the bottom of the slot in the pressure adjuster).
Hammer screw flush with face of block - 8.6 ft- lbs. 2 turns in (before this would have made little or no difference)12+ ft-lbs. Backed of about 1 turn and 11.2/3 . Yet to settle things down and lead the barrel in.
Why or how this should have happened I dont know, but at the moment quite chuffed.
Many thanks to you all for your inputs.
Will get some pellets through it and see.
Cheers and all the best.
Geoff.