I was working on reloading my first 30-06 as a learning lesson and struggled to say the least. I have watched many video's and read the reloading book from Hornady. I attempted to setup the sizing die so that I created a headspace gap of .003 on a once fired round out of my rifle. I just couldn't budge the head back at all and ended up ruining the die and shell. Well screwed that up for sure! Fortunately they aren't terribly expensive. I spent the evening thinking about what I did wrong and am still a little baffled. My assortment of once fired cases all measure very close if not exactly 2.0450 using the Hornady headspace measuring kit using the .375". The new unfired shells also measure 2.0450. Would a new gun and new shells have such tight tolerances that the cases just didn't stretch at all? After the fact researching I believe the minimum measurement on a 30-06 case from base to datum line is 2.0487. So I am already below the minimum with new shells and the once fired shells. I suppose trying to go even smaller is what killed the whole deal? Wish I had seen notes about that in the 15 some articles and video's I watched about headspace. They all just pretty much say for hunting to go .003 below the spent round case. I'm guessing that didn't work out at all since I am already below the min? Any advice? Do I just use the full sizing die to neck size them? Do I get neck sizing die? Don't want to break another die so any advice would be appreciated. Gun is a new Tikka T3X Lite Stainless if that matters at all. Only about 150 rounds fired in it.