This is all interesting stuff and I’ve enjoyed reading all these comments.

I converted my Webley mk 3 to a synthetic parachute seal years ago and it really smoothed the shot cycle out and is within 3fps with a certain pellet ,But this thread has made me want to try a leather seal on my 97 just to see how it feels? I currently run orings as just a test and I’m not liking it much, bit too snappy and quick. I like a soft shooting springer even if it is slower than a short stroke which I gave a few for Hft which are short strokes, but my 97 which I bought from New has always been snappy and harsh compared to friends 97s, so I’ve experimented for years trying all sorts, new cylinders, seals ect but I’ve never thought of trying a leather piston seal which would seem quite a crazy thing to do .......but I think when I get a bit of time on my hands I may just try it.

Atb
Daniel