https://youtu.be/AH_TSKVa1VY?t=2m30s
You can't see the tracer in the game, but impact is visible and says that you just sent 20 kg of uranium into someones ass and in a half of a second.
I'm not sure if some future projectiles will be so slow, but in the game there are still heavy ones I guess, if - not, why they even can penetrate Merkava so easily without references to new technologies and being lighter. If yes, there is heavy type, so it needs some speed adjustment I guess.