I bought some new Lapua brass from Bruno shooters supply (excellent customer service, inexpensive 3 day mail, and they sell any quanity of brass from one piece up).
Anyway, their guy told me that for the first use, I would want to load a mild load with the bullet touching the rifling to break-in and form the brass. He said the worst thing that I could do is load my choice hunting load for the first use.
I've always used spent cases and wonder if this practice is really necessary, and it sounds time consuming and expensive to load up and go waste 40 rounds before loading what I want. Comments???