 The second explanation often mentioned involves the initial rifles themselves which were chambered for the .244 and .243 cartridges respectively.Remington selected the Model 722A and 722BDL when first introducing the .244 and Winchester relied upon their Model 70 for their .243.The Model 722A was often cited as ‘plain’ while the Model 70 was more upscale in comparison and thus purportedly led to greater acceptance of the .243 in the market.