Do you start load development with virgin brass?

[Down South]

Using once fired brass is all fine and dandy if you use 50 cases, but if you are shooting F class and you are starting the yr with 500 new cases (in that exact position right now) then I'm working up the load in new brass and shooting matches. When I get it all once fired I'll shoot a couple of groups to make sure it's still shooting like it should.

This ^^^^^^^^^^

 

[L W P]

What he said.

Years ago I prepped the primer pockets and flash holes in this same manner. After I had done this a buddy of mine told me to never preform that procedure on virgin brass because you will loose pocket life. He told me to wait until I had fired the brass at least once. He was right, I only was able to get 10x firings before the pockets became loose. After that I've never uniformed the pockets on my virgin Lapua brass and the pockets have lasted twice as long. Just my onion.

 

[Mr.Knowit all]

I use Lapua and Norma Brass right out of the box and with little preparation. As long as my SD is low and I shoot under .5 min.... I'm good.