I have a BSA Ultra SE and Weihrauch HW100. The Ultra is tuned by Airtech, the HW100 standard.
I use a 3 litre air bottle to refill. It is approx 3 years old and was recently refilled by Carl at Airtech.
Both rifles will only fill up to 160 bar , this is a recent problem, they always used to fill up to whatever pressure you wanted.
I suspect the bottle or attachments are at fault. Any ideas about what the problem is, and how to sort it?