Snowpeak Leaking M60B, up to a point

I recieved my m60B last year and used it all summer and fall. Stores it in winter and got it out last month to shoir a pesky groundhog on my wife's garden. First shot, the guge was showing full. After a few minutes, shot the pest again and shot a third time to finish him. Last shot felt weak and I looked at the gauge and it was at reg pressure,150bar. Replaced the o ring just below bottle since i cannot detect any leak. Filled it up and it would leak until it reaches regulator pressure and stop leaking. I cannot find the leak with a soapy rag . Looking for recommendations on how to proceed.
Thanks
Gil
 

Maybe more owners will chime in?
 
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Maybe more owners will chime in?
Thanks for posting this thread, clearly shows machining problems exist with some bottle collars. OP should be able to research if he shares similar problem. WM
 
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