I have been working through a misfire problem with my Ruger Hawkeye in 35 whelen. It started not firing about every 5 or 6 shots. I started looking at my reloading first off and found the two misfired bullets I kept were .15 and .18 inches shorter (measured at the neck) than brass once fired and not reloaded yet. All my other brass is about .05 inches shorter that once fired brass after reloading. I assume .15 inches is quite a lot and could be a likely culprit for the misfires.
All the other components look good. Primers seated well. They are from the same box that I use with a couple other guns and those guns have never misfired, so I am no too worried about the primer. I have not disassembled the bolt yet to clean and inspect, but will likely do so just because.
So is .15 too much headspace?