I am familiar with Zaloga’s book. Its a very good primer on the topic, and is somewhat analogous to the earlier Know Your Antitank Rifles book from the 1970s. He does a good job at giving a broad overview of the topic, which is good for most readers. He probably has more sense than I do, as covering just the major production guns is certainly easier than running down every rabbit hole that you come across. The US prototypes for example: I’ve got four unique guns under review, and these are just the domestically produced guns that were actually tested, nevermind the Solothurn guns that were sampled or the Boys rifles that were issued.
I will be covering ammunition in a lot more detail. I am not an “ammo guy,” and I do admit my limitations in that area. My main ally has been a friend of mine, Ken Huddle, and then information that I’ve been pulling off the internet as time permits. Its a long process, as I’m sure you know.