About the time of the 284 win. folks discovered short , fat cartridges were a little more accurate. Think PPC against the old favorite triple deuce. I tried the 6mm and 25 version of the 284. Both were outstanding in the short action 700 I had.
Hasbeen
The PPC rounds didn't appear until the 1980s.
P.O. Ackley's book on wildcats lists a couple of short, fat beltless "magnums" virtually identical to the .300 WSM made by turning the rims off .348 Winchester brass and cutting an extractor groove. They appeared in the early 1950s, if I recall correctly, and were designed to fit in the 722 Remington action.
