This is a confusing topic and always has been for me. Giacomo always told me to close the action of a Perazzi with pressure on the top lever and when action is closed, release the top lever. I have always done this with Perazzi and Browning superposed. I have been told just the opposite on English guns by David Trevallion as well as other English gunsmiths. I think Krieghoff guns are built to not be gently closed, but NOT slammed shut either. So, I'm still a little confused as to the BEST method of closing the actions on all these guns!
