The Luftwaffe 8x57 PmK has a load of 0.5 g white phosphor which sorrounds the steel core as seen in the technical drawings below. Upon firing the round, a solder point which breaks through friction heating in the barrel is destroyed and a small hole is exposed through which the phosphorous smoke exits the projectile. The WP burns as soon as it comes in contact with oxygen and sets any flammable objects on fire which in may come in contact with. This leaves a trail of white phosphorous smoke up to 700m long, at which point the WP inside is pretty much burnt up and the inciendiary properties are lost.
Armor penetration values are 6,5 mm (90°), 5 mm (60°) at 100m for hardened steel (150 kg/mm^2).
In the following video at 0:15 and 1:13 you can see PmKs being shot. They describe it in the video as a B-Patrone, but someone ripped them off. The two I marked are definitely PmK.
At 4:45 you can see tons of PmK being shot.
I opened an issue on the bugtracker, it is #840. http://tfbt.nuvturais.de/issues/840
Maybe this is known and the missing smoke is an engine limitation. I could guess that thousands of PmK in the air may cause a massive performance drop. But there are other inaccuracies with the other ammo as well, so it might just be a bug.
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