I think Winchester should have sued Jamison or Winchester should have patented their idea.
"1964 Gun Digest page 299.
American Bulleted Cartridges by Kenneth L. Waters
284 Winchester
"An entirely new short-cased cartridge designed to give short action rifles ballistics fully equal to the longer 270 Winchester and 280 Remington rounds.
Case Length of the new round is 1/2-inch less than a 270, but a larger body diameter with decreased taper and sharper shoulder provided the same powder capacity. (same concept for the wsm)
This increase in body diameter introduced somewhat of a problem; it was necessary to keep rim diameter the the "standard" size (common to such caliber as the 308, 270, and 30-06) in order to permit use of the 284 with the existing bolt-face dimensions.
This sub-diameter rim is founded on the 425 Westley Richards cartridge, and was also used in the past in various German calibers."
There is nothing original about Jamison's cartridges. He copied or used the same idea from Winchester who
borrowed it from Westley Richards.
