It is blank ammo. Look here under blanks at the photo of the 30-06 M3.
http://cartridgecollectors.org/30-06intro/
My first thought was 30-06 blanks from Remington Arms made in 1943.
Still sure on the blanks made in 1943 part,
But since it is in a German position, could they be 8mm Mauser blanks? An 8mm case is the same size at the head as a 30-06 but is a little shorter in length.
Remington Arms used a RA headstamp, but A/S Raufoss Ammunisjonsfabrikker, Raufoss, Norway also used a RA headstamp code.