thanks neil that's great advice.
checked the hole underneath, no leaks there so gunna be where you said.
is the cylinder easy to remove once emptied? don't usually do my own repairs but may give it a whirl if its easy to do.
RN10 SIDWINDER 30
DAYSTATE HUNTSMAN CLASSIC
WEIHRAUCH 97K SYNTHETIC
BROWNING 525 ADVANCE
BERETTA 391 TECKNYS