Despite what many people say, I personally believe the 284 Winchester was the cartridge design that inspired the WSM line of cartridges.
What case did Rick Jamison base his Short Fat magnums on ?
These were certainly the direct ancestors, but the 284 Win dated from the mid ‘50s , So of course it was inspirational.
With a rebated rim, fairly minimal taper, and 35 degree shoulder, all point to this inheritance.
