Recently, I went through this. Bought a .300 RUM barrel, and my first attempt to fire failed. Ammo was Remington Premier Core-Lokt Bonded Power Level II 180 gr. A repeat strike also failed. Next round fired. Then I went through a random set of success/failure with the next six rounds.
I asked for advice on another forum and every technical reply presumed headspacing. I repeated the rebarreling procedure and had no better luck. Long story short, I called Remington and sent the box back; unfired dimpled cartridges, spent brass and untested rounds. Last week, I got a packgage and letter, and this excerpt is their findings.
"The head to shoulder dimension was below process minimum specification. This condition may cause the shell to crush up in the chamber as the firing pin strikes the primer and deliver a soft blow by the firing pin. The primer mix sensitivity was found to be normal. Sometimes our equipment acts up and we have to apologize."
Don't know if this helps, but you might find it useful for diagnosis, anyway. They did me right; the PPL II CLB was exchanged for some PPL III with 200 gr. Swift A-Frames.
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