I have some new lapua brass coming this week, I am finally ready to start reloading. It will be for a 308 win. I am not going to neck turn the brass. The rifle has a good custom chamber that allows me to shoot federal match and black hills match ammo without any problems. Don't know the exact specs of the chamber. I was just wondering if there is a big difference between new brass and fire formed brass?? Can I start load development with the new brass or do I need to fire-form it first?