These hulls appear to be pre- Remington RXP Hulls. They are straight wall but plastic based.. sort of a high basewad white plastic inner with the traditional green ribbed on the outside. These are as new as new can be for being at least 30+ years old.. the are primed with what I assume are either 57 or 97 primers. Has anyone seen any of these lately or have any of their own? I have 6-8 boxes of 25 of these.. Pretty cool old shells.. I sort of wonder how much they are worth (if anything more than scrap).
Anyway, here are some pictures.