Nice catch Tom. Just a little more background.
.224 Weatherby
History
Although Roy Weatherby's cartridges have been extremely successful as well as helping introduce the hunting world to the benefits of high velocity, his contributions to the .22 centerfire market have achieved a more limited success. Weatherby's first foray into the .22 centrefires during the 1940's resulted in the .220 Weatherby Rocket. Based on the .220 Swift with improved dimensions the .220 WR suffered immense throat erosion. Weatherby's next cartridge, the .228 Weatherby magnum was based on a shortened version of the .300 Holland and Holland magnum necked down to accept a 70 grain .224 caliber bullet. The .228 was no more successful than the .220 and soon became obsolete.
Finally in 1963, Roy Weatherby introduced the .224 varmint master. This .224 cartridge was a scaled down version of the .300 Weatherby, giving ballistics almost identical to the .22-250. To obtain the maximum amount of power, the chambers of the .224 were cut long to allow a longer peak pressure to build up bullet speed (a necessity of the RUM cartridges also). When Remington adopted the .22-250 in 1965 the .224 was blown off the market. To recoup sales losses Weatherby decided to chamber rifles for the 22-250. This was the first commercial cartridge to be chambered by Weatherby and led to the full range of standard chamberings that are available today.
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