Still off the thread's subject, but photo by Catman, is the bolt not closed? It looks high to me.
I have a Savage rifle with a 3 lug bolt, on this rifle it is easy to catch the bolt and lift it part way when carrying it for a while. I get misfires when that happens, I think the firing pin hits the opening cam and partially closes the bolt but slows the firing pin down enough that it does not strike the primer hard enough to fire. Seems like it could cause hang fires also.      Maybe I am not seeing it correctly or I worry to much.