The book appears to have been reprinted by Linda Sweet and one of the outlets (from which I bought my copy) is the New South Wales Rifle Association shop here in Australiaicon. They’ve just got more stock in from Linda. The book costs AUD13 (approx. US$9) - not exactly a king's ransom; I would not expect the postage to your side of the pond to be too horrendous.

https://www.nswra.org.au/products/co...rifle-shooting

The edition that is available is the 7th (1982) which relates to the contemporary generation of 7.62 calibre target rifles (Barnard actions, etc). I believe that the last time the book was based on the Lee Enfield was the 5th edition (1961). The edition here is the 4th (1956).

Bob