Accuracy values for the main guns - MBT's.

[JaM]

A the other side, i like more your values than those in original SSI Steel Panthers 2. In SSI OOB 120mm smothbore guns had accuracy over 35,125mm guns 25 (same as 105mm)Your lower values are good, the only problem with them that weapons are not modeled correctly. Lenght of gun is not good variable for accuracy of smothbore guns. It has much more to do with kinetic energy than accuracy.My suggested values for tank gun accuracy are:

L/D Value
10.........................11
15.........................12
20.........................13
25.........................14
30.........................15
35 and more........ 16

I reworked most of OOB with those values. Those values dont change much, as those values dont make big difference to your values, but they make older guns( with old ammo ) less accurate than modern guns over longer range as rangefinder and firecontrol value make all guns to have accuracy to 1200-1600m over 90%.With this you should see difference between same tanks with different ammunition,(like T-64B in Russian OOB, T-64B with BM-29 from 1983 will have lower accuracy than same T-64B with BM-42M in 1998 or M1A1 from 1987 with M829 will be less accurate than M1A1 from 2003 armed with M829A2)

[JaM]

link for L/D values of most of soviet APFSDS rounds :
http://armor.kiev.ua/fofanov/Tanks/ARM/apfsds/ammo.html

[Cris]

I agree with the comments wrt the penetrator L/D's but to take only those into account would be a similar issue to taking only Barrel length... both are a factor as is manufacture

Rather than taking to account one factor perhaps a couple of multipliers or an weighted average of penetrator l/d Barrel length..

Just a thought.

[JaM]

Thats true, but there isnt a modifier for technological advancement. On paper, is soviet 125mm gun impressive (L48-50,1700-1800m/s muzzle speed...),but in reality it dont count. First gen soviet APFSDS were very unaccurate.Round of choice was HEAT,becouse it was more accurate and destructive. Western APDS rounds were more accurate than first and second gen. West APFSDS (M735,M111,M774...) I saw somewhere on Tanknet some data, where M60A3 in 1980 firing APDS was more accurate than M1A1 with M827 or Merkava Mk1 firing M111 (87% at 2000m M728, 84% M827 and 73% M111,but M111 accuracy is combat value from "1982 Peace for Galilee",accuracy during tests is always better) So for accurate accuracy :-) formula you need count with much more variables,but many of them are not public domain. (speed loss of projectile at distance,dispersion,quality of discarding sabot etc...)

[Cris]

Yeh, You are right but.... In the end we could be pedants one and all and take into account all sorts of variables from Barrel wear to what socks the gunner put on... Its a game and pretty good at that... Keeps e entertained thats what cousnts I suppose.