I load the 52 gr. AMAX in .223 and the 155 gr. AMAX in .308.
Both bullets are excellant! (If I may say so)
The 52 gr. AMAX is fast and accurate. I have gotten Sub MOA groups with it from a standard Bushmaster rifle. Its terminal ballistics are very similar to those of the VMAX line. A large shredded permanent cavity and tiny bullet fragments are the order of the day. It is a great round for targets and varmints, although heavier rounds may perform better if you are doing serious paper punching.
Expect velocities to top out around 3300 FPS.
52. grain AMAX bullets work just fine when seated to mag length. In fact, until I started loading the 75 gr. AMAXes I seated everything to about 2.25-6".
Here is my data:
Load: 02H3
Bullet: Hornady 52 gr. A-MAX
Powder: IMR 3031
Case: Winchester 223
Primer: CCI400
Charge: 25.5 gr.
OAL: 2.25"
My smallest group size from this load was .26" at 50 yards.
Buy a box, and if you don't like them, send them to me!