Frostop,
Hornady list the bullet for varmint/target/medium game in their reloading guide. Reason they seem contradictory in web verses book statements is that the bullet is traditionally for target, but lots of folks in the long range hunting world have come to discover that the thin jackets used on the Amax open up very well at extended ranges and explosive bullets are usually wanted for varmints.
You will see lots of threads on the use of Amax bullets in the forums. I myself am switching to them for target and long range use this year, just because, they shoot well for me, I can get a more reliable supply of them than Bergers, and they are priced well.
I would caution against using them at short range for game though. They be very destructive on shoulder shots and the like.