The AMAXES were initially toted by Hornady as a target bullet. They have a thin jacket on them. But since then, a lot of people have found them to be useful in hunting. Since they have a thin jacket, they will come apart easy. Especially if driven really fast and shot at short ranges. SO, will they do the job? Sure, tons of people have been using them with great success. But if I were you and I was going to use this bullet, I would use the heaviest for caliber amax that I could which would be your 140 gr amax. The heavier bullet will get you more penetration as well as buck the wind. They should prove very formidable against deer and antelope. Now for elk...I am a fan of larger calibers for those critters but again..many people have taken them with 140 gr amaxes as well.
By the way, if you don't have a need for those 123 gr amax, let me know via private message and I will buy them from you. I use them for coyotes.