02-13-2017, 01:01 AM
I doubt any of the following are the cause, and I'm pretty wet behind the ears in regards to reloading. But was the powder trickler cleaned out/no residue? No copper solvents accidentally got on brass? No home brew case cleaners or anything I assume? If you were measuring case length with calipers they were indeed zero'd AND accurate at the length the case measurements were taken? That was a interesting point about case stretching and tight tolerances of the 300. Sorry to hear your misfortune. THIS is why i want a chrono before i even consider working loads up for smaller stuff... I could load some now but I'm im no hurry.