Plastic blank ID

I’m probably making this more difficult than it should be but…
Rim: .632
Base: .538
OAL: 2.93

This is a F1 blank variation of the french 7,5 x 54 mm Mle 29 with a R

Thanks! Interesting. I knew the plastic looked like 7.5 rounds I have, but I didn’t think of the bigger base as being French.
I should add that all three photos are of the same cartridge, I couldn’t get the color or exposure how I wanted it so I just posted different views.