I once bought 100 rds. of 270 Win. (Norma) that would not chamber in a stock 700 Remington 700 barrel until I ran them through a full length die. It pays to check them in your chamber before loading.correct , I do run my new brass through my full length die . new brass is way undersized so the full length die does not size any more , it only makes sure it's round for ease of chambering .