To be real honest, unless you had ammo loaded with Rem, shot them and then reload them, you may have a hard time finding new Remington .260 brass. I will keep an eye out for you and send you a PM if we find any,I am really looking for remington prefered
What rifle are you shooting -twist , Length, bullet, powder?
What are you hunting?
Hey Merry Christmas and Happy New Year!!!
Len & Jill
EDIT
We may have some Rem 243 Brass if you want to neck up I'll check.
Len