Background - SA 9mm 1911, 19 lb mainspring, Ti FP, 1X FPS. Most folks change the Ti to steel, but gun had functioned fine for 25K rounds albeit without a really pronounced FP strike. My wife is now seeing very light primer strikes and 1/20 or so fail to ignite.
The suspect rounds also induced a light strike in my wife's backup gun. I've come around to believing that the issue relates to my switching from a two-die seat/crimp setup (RCBS microseater/Lee FCD) to a combo die. Ideal case mouth is .380 - .381. I've measured some rounds at .377. Is this enough to cause the round to seat just a tiny bit deeper in the chamber? It wouldn't take much given our many thousands of rounds of good primer strikes would be classified as light?
I'm going to load some dummy rounds in the am with case gauge, barrel and micrometer in hand. I'll also load some with the two-die setup.
The suspect rounds also induced a light strike in my wife's backup gun. I've come around to believing that the issue relates to my switching from a two-die seat/crimp setup (RCBS microseater/Lee FCD) to a combo die. Ideal case mouth is .380 - .381. I've measured some rounds at .377. Is this enough to cause the round to seat just a tiny bit deeper in the chamber? It wouldn't take much given our many thousands of rounds of good primer strikes would be classified as light?
I'm going to load some dummy rounds in the am with case gauge, barrel and micrometer in hand. I'll also load some with the two-die setup.