All my Lapua brass is headstamped LAPUA.
So Remington does not use Lapua brass......someone tried to tell us that the other day...we didn't think so.
I bought some Remington Factory Match for my .338 Lapua when I first got it. The Ammo was advertized on the box as being loaded with .250 gr. Senars, I didn't look at the brass until I was home but it was Lapua Brass aswell, but only had the "L" in a box on the head.