True, and he wrote an article on it in one of the British sporting journals. I'd love to see the article if anyone knows where to find it. I don't know whether it was written pre or postwar. Could have been either, as the Model 70 was available in .220 Swift in 1936-7. The Model 54 was also offered in this caliber in 1934-5.

He also wrote a piece in American Rifleman on the cartridge in 1949 called 'the Neck Shot'. (from Wikipedia)

You can still visit his old Scottish estate 'Corriemollie'.

http://corriemoillie.com