I have been reloading for 30+ years and did it earlier this summer. New dies, new .243 and used brass. Set the die to FL size in my press, loaded my rounds, and went hunting. Dies were not set right. Shoulder did not go down far enough and I had a tough time getting my ammo to load. I had to sort thru it to have enough to carry with me on the hunt. Left a lot in the box to shoot later.
Recently got my press, my dies, and my rifle. Got the fired brass and sized it. Tried it in the chamber. Still a little tight. Turned die into press another 1/32nd to 1/16th of a turn and tried again. Did this a couple of times before the bolt closed easy. Die and shell holder are meeting tight and press handle is camming over. I am close enough where I should probably have .001" or .002 removed from my shell holder or the bottom of the die.
Never again will I size brass for a hunting gun without having the gun available when setting the dies up to size the brass to fit my guns chamber. Good lesson for all levels of reloaders.
Steve