I saw 12ga tracer shells at a small gun shop, so I bought a box figuring they would help figure out where my shot was going when the bird didn’t break.
Always keeping 2 tracers in my pocket on the skeet field, I would occasionally shoot one when missing consistently. But every time I shot a tracer, the birds always broke.
Perhaps I should have bought a whole flat of tracers, using them for every shot in several rounds of skeet.