What do you mean? Many sources show the M289 at 600mm penetration, in game it's 550 a 8.3% down grade and the M829A1 at 700 and 640 in game a 8.57 % downgrade. So yeah it's not exactly 10%. What are the APDamage number you are using in the game for the M829, DM-33, and BM22,26,29,32 and 42?
The Soviet standard for calculating the penetration limit of armour piercing projectiles is V80, meaning that the expected consistency of achieving full armour perforation given a certain projectile velocity must be 80%. In formulas, V80 must replace V50 (50% chance of armour perforation). For example, if a certain projectile has to penetrate 500mm of steel, then at least 80% of all projectiles of that type must achieve that standard. Also, the Soviet criteria for a full armour perforation dictates that 80% of projectile mass must be recorded on the other side of the target plate as opposed to U.S Army criteria which only requires that a hole is produced in the armour such that light can be seen from the other side. Overall, Soviet standards were not only stricter, but the steel they used for targets was sometimes of a greater hardness than NATO targets. In reality, the given penetration data may be an underrepresentation of the actual achievable penetration of these shells.
if you wish to compare american and russian data you need to mark down american data by a large margin.... V80 vs V50... 80% of mass vs 3mm hole... high hardness vs medium hardness plate...
Paul Lakowski stated that perforation values for V80 vs V50 alone could already make an 8% difference
similar disparity`s also occured with ww2 ammunition
the comparison between the M62 and the BR-365A can shed some light on the sheer disparity between american and soviet penetration criteria
penetration criteria without adjustment
penetration at 500m vs 30 degree plate: 91mm
penetration at 500m vs 30 degree plate: 93mm
ww2 ballistics and gunnery adjusted penetration
penetration at 500m: 123mm
penetration at 500m: 116mm
the difference is considerable between american and soviet penetration criteria and they cannot be used interchangably without the odermatt equation
< Message edited by gbem -- 11/30/2018 2:51:22 PM >