I would agree with youI dont see how it could be doing that to the brass if your not bumping shoulders without there being air or lube between the die and case shoulder.
Max case length on a 300PRC is 2.58 i believe, I would trim all to 2.75So it appears it's the 2.57 to 2.59 difference in length of brass I have my dies set up to. Not enough wiggle room on the brass that's 2.59 in length.
So the end of the neck is hitting in the die (expander assembly)?So it appears it's the 2.57 to 2.59 difference in length of brass I have my dies set up to. Not enough wiggle room on the brass that's 2.59 in length.
I seriously doubt it. If the case was too long and the end of the case mouth was hitting the die it would easily push the neck down by flexing the shoulders. You have a classic lube dent IMO.So it appears it's the 2.57 to 2.59 difference in length of brass I have my dies set up to. Not enough wiggle room on the brass that's 2.59 in length.
I have dozens of Redding dies and have never seen the need for a vent hole. I only rarely see a lube dent and its always caused by me overdoing the lube.Do not know why Redding do not use a vent hole, life would be easier with one.
Cheers.