Today I had 10 "click" (of 20 cartridges) in my AII frame. I went home - pulled out the bullets - and tried again. Click, click and 8 more clicks. Then I switched the barrel over to my blue frame, and 10 "pang". Then I primed the same brass, cleaned the AII frame - and tried again. SUCCESS.
The AII frame was not very dirty so it seems that it isn`t too much dirt the frame accept before the abovementioned happens.
I got a little "panic" because I travel to Africa next week. And yesterday the zoomring on my Leupold 2,5-8 started to "hang up" (but I had an extra one in the cabinet).