Have you guys seen these?
I couldn't find the case specs for the 375 but it looks like a variation on the 9.3x64; nice.
https://www.hornady.com/shop/shop_im...uger_illus.jpg
About the 308, well.....déjà-vu...?
http://www.chuckhawks.com/308_marlin_first_look.htm
https://www.hornady.com/shop/shop_im...rlin_illus.jpg