Took the words right out of my mouth.

Another thing that people should take into accound when looking at modern tracers used by the military (in the past 30 years) is that they have a delayed start, so that they will go a hundred yards or more before lighting. This is to keep the operator from being blinded in low-light or night situations and it also has the benefit of not giving the enemy a perfect line to where the gunfire is coming from.

Also that is .45ACP, quite possibly the slowest tracer ammo avaliable in the world (do muskets have tracers?). So it is not going to behave exactly like something traveling 3-4x faster than it.