Thanks for the advise guys. I tried tightening the Allen screw on the manometer and 'job done'! No more leaks and the rifle gauge is reading about right.

If it doesn't hold I'll be in touch with Julian. Although he did a complete service on the rifle not so long ago.

Jamie

After advise on this forum I managed to adjust the power on my S400 from 12.9 to 11.2. Mine is pre anti tamper. Unfortunately I now seem to be losing air when I charge the rifle. I normally charge to 190, this on the air bottle. I can hear air escaping from the breech area and the gauge on the rifle...

I'll take the grub screw out and see if there's anything else. I'll let you know. Thanks.

My S400 is pre anti tamper. I've just run it over the crono and it's running around 12.8. Tried turning the allen screw in but doesn't seem to make any difference. Am I doing something wrong or is it a Gunsmith job.

Jamie