The A-Max bullet is made with one goal in mind and that is accuracy. It is not designed for controlled expansion at any velocity and in fact whether it expands at all or just plain blows up isn't a consideration in its design criteria.
Why do folks insist on using bullets for things they were not designed to do and then most times bitch and complaint about them on sites like this when they do not live up to their unrealistic expecations to boot? No I'm not saying you have or would but far too many do this.
Surely with all the excellent hunting bullets out there you can find one suitable for your hunting needs. Leave target bullets for target shooting and use hunting bullets for hunting.
During the initial process of finding a lod for this particular 6.5x55, I purchased the then very high priced factory ammo, which in our area was only available from Norma. I decided then and there that it would not happen from then on out, especially after the first box shot a 10+" pattern rather than a group of any sort.
I purchased and loaded bullets from Speer, Hornady, Sierra, and Nosler trying to get a load that shot within an inch at 100yds. As this was all coming about the A-Max hit the shelves and with the added length I hoped that I would be able to seat out ot the lands and possibly that might help some. At the same time I also got my hands on some of the 140gr Bergers from a friend simply to see if they would shoot. With the free bore of this rifle I can sit an A-Max on the top of the case and chamber it with out touching the lands. So this wasn't helping much where I had hoped it would. I contacted Hornady about it at the time, and their response was that they had not even considered it at the time, and since it was such a new product they had their doubts about how well it would work.
My thinking was that since the 140gr was so long for it's diameter, and due to the muzzle velocity of only 2550 - 2650fps, that hopefully it would hold together. I tested it first for accuracy which was outstanding getting consistent groups of 1" or less out to 200yds. The rifle was only intended to be used in the woods or for short range shots from a stand. I shot them into water jugs, and all sorts of other stuff well before putting them into live critters. Their performance in the other stuff convinced me of their ability to hold up on deer easily at the ranges and velocities I was intending.
Hogs are prevalent in our area and provide a great tasting test medium. If a particular load whether handgun or rifle, or a particular broadhead will take them out quickly and efficiently, generally it works very well on a whitetail. After over a dozen hogs at ranges from around 10ft out to over 300yds, I found that the A-Max do indeed work well.
This is not to say, as you put it, there aren't other bullets that will work, or are specifically designed to work on game, simply that the others did not shoot satisfactorily in this particular rifle. Nowhere close. Believe me I tried for two years off and on working up loads for this rifle changing everything along the way except the barreled action.
Now this same rifle, given a diet of PRVI SP ammo shoots one hole groups. It is cheaper than I can load, and works equally as well putting things on the ground. I do believe however that there are extremes in which even bullets designed for hunting become fragmenting grenades, but the opposite can also be the case, where they simply pencil on through with out any apparent expansion, due to velocity and or the thickness of the jacket. There are times however when the construction, and velocity can be matched for reasonable and proper expansion in a given bullet no matter what the original intended use was. This is simply one of those cases in my opinion.
The initial velocity of the OP was stated to be in the 2500fps range, the SD of this particular bullet, combined with the velocity should work out just fine for him. Now had he said he as going to shoot them in a 300 RUM at 3200fps, I would have told him to go with an Accubond, however this was not the case. As an avid loader, and shooter, I know for a fact that when a new bullet hits the market it will be used for everything anyone can think of. If it doesn't work then it doesn't work, but if it does, why not use it. Similar to when they started using pistol bullets with sabots in muzzle loaders. Use the right one and everything is fine, use the wrong one and get a blowup. You have to use one that will perform within the parameters of the load or your risking a failure. Keep it within that parameter and you get good performance. The key is testing things out before heading to the game field, this is where I feel folks drop the ball. If they put in some time setting up targets simulating game, I believe there would be way less of the failure reports. However some folks can simply get plum lazy about things and this isn't the fault of a particular type or brand of bullet.
Not looking to argue, simply pointing out my experiences with the A-Max.