Finn's article on the 270 was published in American Rifleman, May 1984, page 48.
The scans posted above are from a collection of his work, Hunting Rifles and Cartridges, published by the NRA in 1990, ISBN 0-935998-58-6. Finn was irritated with the compilation because of the number of editorial goofs. NRA went so far as to send out a 4-page notice of errata to all who purchased the book from the NRA store. Unfortunately, I've mislaid my copy of that notice.
--Bob
