possible alternate cartridge (6.35x53mm) for the early AR-15

[RCS]

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 gr bullets at 2600 & 2460 fps. Note how this cartridge fits in the AR15 magazine. This might have been an excellent choice

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