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Jim, would you want the Duplex cartridge or ball cartridge to shoot a qualification ?

I liked the 280 too and also the 7x49mm Liviano that FN sold to Venezuela for their early FAL rifles

During 1958 & 1959 Winchester developed the 25 Winchester cartridge (6.35x48mm) by necking down the old 25 Remington. The velocity with a 70 grain bullet was 3.345 fps while the duplex used two 53...