Back to the original question:
There is loads of data, some of it current some not, but it will give you a starting point, at the AH Trainers website. Just follow the link to the "projectile strength analysis".
FWIW, the US uses the 4.5inand 5in rockets, and the UK uses the 3.5in rocket for air to ground use. The US 5in is the most powerful at 156 pts of damage, next is the British 3.5in at 140pts of damage, and a distant 3rd is the US 4.5in rocket at 93 points of damage. All the sources I've read lend all three to being "general purpose" rockets to be used in either HE or AP roles (exactly as they were used in the real deal). Also, the 4.5in rocket is basically the "bazooka" rocket, hence the tubes. It is also the rocket used on the M4A3 75mm "Calliope" tank as well. On aircraft, remember those tubes cause drag and add weight.
In AH, an OBJ (i.e. "object") such as a ammo bunker, fuel depot, radar, barracks, or house takes a total amount of 312pts of damage to destroy. Some of the lack of actual damage by poundage (for lack of batter terms) is made up from the impact of the projectile. Hence, the ability to destroy one of the a OBJ mentioned with a direct hit from a single 250lb bomb.
btw... here an added tid-bit for those who may want to know:
Tank Main Gun Statistics for Aces High
Country Tank Caliber/Gun Reload Time HE Dmg (in lbs)
Britain Firefly 76mm Q.F. 17lb 7.2 sec 146.3
Germany Pzr IV 75mm KwK40 L/48 5.4 sec 156
Germany Tiger I 88mm KwK36 L/46 6.3 sec 234.3
Soviets T34/76 76mm F-34 8.2 sec 156.2
Soviets T34/85 85mm ZiS-S-53 6.8 sec 231.8
US M4A3 M3 3.6 sec 173.8
US M4A3 (W) 76mm M1A1 3.6 sec 103
US LVT-4 75mm M2 3.6 sec 154.5
