I have a Jules Bury high grade SLE that has non-rebounding hammers (I've been told it was an action intended as suitable for a smaller cal DR). It is sensitive to softer primers, WW209's being one, it seems. The gun had a visit to Otto Weis while I was living in Germany and the cocking bars are as tight as possible. Some years ago I shot successfully with Fed209's. Will be trying them again as soon as I get a box.

DDA