Set the shoulder back?, Never set the shoulder back, apply the leaver policy, leaver where you founder. It is one of those statements that sounds ‘cool’ “fire the case to form, then neck size it 5 times, then full length size the case to start over” HOW? Can a reloader start over with a case that has been fired 6 times, the case has been fired 6 times! Then there is the other bad habit ‘saying’, the case is not fully grown until it has been fired 5 times etc..
Then there are my cases, my cases get hammered, hammering a case from the inside out causes them to loose their memory, I form first, then fire, others fire to form then repeat the cool statements above like “Fire it 6 times then start over”, I am the fan of cutting down on all that case travel.