When were the Weatherby cartridges developed?

Cartridge – Year Introduced Commercially:

.220 Rocket Magnum – 1945

.224 Weatherby Magnum – 1964

.228 Weatherby Magnum – 1947

.240 Weatherby Magnum – 1968

.257 Weatherby Magnum – 1945

6.5 Weatherby RPM – 2019

6.5-300 Weatherby Magnum – 2016

.270 Weatherby Magnum – 1945

7MM Weatherby Magnum – 1947

.300 Weatherby Magnum – 1945

.30-378 Weatherby Magnum – 1996

.340 Weatherby Magnum – 1963

.338-378 Weatherby Magnum – 1998

.375 Weatherby Magnum – 1947

.378 Weatherby Magnum – 1956

.416 Weatherby Magnum – 1989

.460 Weatherby Magnum – 1959