I was looking at some empty cases from my .44 reloads and noticed that some of the primer indentations - i.e. strike from the hammer - were quite odd.
Instead of the nice rounded indentation of normal depth some of the primers looked like they had almost no indentation at all - just a very slight crater like the pocket had been ironed out from the inside somehow. The primers weren't flattened out and showerd normal pressure for a .44 Mag. - I would say a medium load.
Cases were Star Line and appeared to be quite normal. The primers were some old CCI LP magnum primers of a lot I've been using for years with no issues. The gun was my trusty S&W 629-2 and light hammer strikes was obviously not the problem- the remaining indenation is too shallow to have ignited the primer.
The load was 14 gr. of Alliant STEEL powder behind a 310 gr. bullet. A similar load with the same components other than the powder was 19 gr. of H110. The H110 fired cases looked perfectly normal as did the loads with STEEL powder other than the odd primer strikes.
Any thoughts or guesses on this one? I'll try to post some pictures but a close up enough to show the details is tough with my camera.