Most various pointed .308 dia bullets in the 150+ range are going to be designed to be loaded in .308 Win, .30-06, .300 Win Mag, etc and so they are going to be tougher to hold up to those impact speeds. At .300 AAC velocities these are going to be inconsistent expanders...
The THompson Center Contender crowd spent decades firing .30 cal bullets out of shorter barrels, dealing with lower velocities. They used cartridges like .30 Herret, .30-30 Win (Contender), .300 Whisper, etc. There is decades of experience with this issue. Look for .300 whisper data and reviews - its near identical to your .300 aac. You can also look for information on reloading .308" dia bullets in 7.62x39 soviet. Again, same speeds, same diameter. What works in a Ruger mini-30 will work in your aac.
The go to bullet for decades has been the 125 nosler ballistic tip. This is a varmit bullet at .30-06 speeds. However, at .300 AAC velocities, it opens well without being overly explosive. It is a proven killer in the these various handgun chamberings, almost all of which shoot at speeds nearly identical to your AAC.
The 150 ballistic tip will be on the threshold of not expanding at 100 yards.... Take a shot that 130 yards, or shoot on a cold day with a temp sensitive powder and get a muzzle velocity that's 40 fps slower, and all of a sudden you have a non-expander.
For newer bullets the TTSX 130 seems to be working well.
If you want a heavy bullet, you need one designed to expand at slower speeds. We have a ton of these: They are the 150 FP bullets for the .30-30. They will work wonderfully, provided they feed in your AR.
American Rifleman did an article on loading for the .300 Whisper. Since the .300 AAC is nothing more than a glorified Whisper (minor changes to keep JD Jones off AAC's back) anything working in whisper will work in AAC.
Fro