... at least, I think it's bizarre. I've never run across it before.
I should mention up front that my 1911 has been altered quite a bit. It started as a 1991A1 that I bought new in 1998. I recently put a Cor-Bon 400 barrel in it, added a new 20 lb spring, a full-length guide rod, a new (lighter) trigger, a recoil compensator and adjustable sights.
Here's what happens. It happens occasionally with regular ammunition (155 gr), and it happens a lot with high-powered ammo (135 gr, 1450 fps). At some point, when I pull the trigger, nothing happens. When I examine the round from the chamber, there is almost no indentation in the primer at all.
Upon further examination, it turned out that the back of the primer had been blown out of the previous round and jammed into the hole that the firing pin comes out of. It is really weird - the blown primer back is a perfectly intact, circular piece of metal that fits exactly in the hole - requiring quite a bit of effort to pry it out.
On the high powered rounds, it happens every other shot. With regular "power practice load" rounds, it happens perhaps every 20 rounds.
What causes this? Is the headspace too big, too small, and what do I do about it?
When I fit the barrel, I reduced the hood a little - should I reduce it more?
Any help is greatly appreciated, since I'm completely without a clue.
As a side note, my two $200 Ballester-Molina copies of the 1911 shot perfectly. Go figure