MP
In all the military tracers I have seen, i.e. 224, 308, 311, 8mm, 50cal, and 20mm, the tracer compound, which is ignited by the propelling powder, is packed in the hollow base of the bullet. It usually has a lot of strontium in it, commomly as strontium nitrate, to make the red flame color.
In a previous existance I briefly was a chemical engineer. I can even discuss other flame colors, but so can any high school chemistry student who paid attention.
Edit:
More to the point, people who were shooting at things that shoot back have always complained that tracers do not go where the rest of the bullets go. Normal procedure is to have every 6th or 10th bullet be a tracer. Fighter pilots were the first to notice the difference in trajectory between tracers and the rest. To be expected that they would notice, since they are routinely shooting at long ranges at targets which need a lot of lead.
For example: How much do you lead a 500mph target at 800 yards?
The problem is that tracers change bullet weight as the tracer compound burns. Enter that in your ballistics program!!
[This message has been edited by Jack Roberts (edited 10-24-2001).]