Have you measured the headspace on your fired brass?
Have you noticed if only partial neck sizing or just touch ammo solves the problem?
Have you made 10x ammo with a 10 thou jam and fired it to see if that eliminates the headspace issue ?
Is it possible that your FL die is pushing the shoulder too far back ?
If all seems well then replace the firing pin Spring, age has softened it or it has spent a little time in the cocked position which is common for some bolts stored out of the rifle, which can soften some springs
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