I used to buy them on special and use them as targets with my (then) 5 year old daughter. Good fun with a 22, and easy cleanup.
Better fun with a 22.250, more involved cleanup.
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100% tracer out of a GPMG in SF mode:thumbsup:
Most NZ Army training areas ban tracer during the summer (very effective at starting fires), so the poor buggers in the ammo area have to pull all tracer rounds out of the belts (normally 4 ball 1 tracer as purchased from overseas)
Come wintertime and a fire power demo, or support weapons course, out come the 100% tracer belts. Like squirting a big red flamethrower all over the place. And you learn a lot about ricochets! (hint, ricochets can come off almost any surface, and at almost any angle. You wouldn't believe it till you see it)