Yes, they did at one time make tracers for shot guns. They were off the market for some time because they didn't work very well and started some fires at some dryer clubs. We shot them only in wet condition and I believe someone is marketing them again.
I think the last ones I had were called Tru-shot. They were reloaded in the old style Winchester cases.
I had a couple of boxes of tracers 40yrs ago. I got them from my Brother in law and at the time he was a policeman. Pretty sure he got them through the Police dept. I took them to the club and had fun shooting trap with them. Myself, I haven't seen any since then. I'm sure someone on here knows if there is any available .
You can buy components and load tracers yourself from D.W. Miesner, Northwest Research and Development Inc. 3431 Wallace Rd. NW, Salem, OR 97304. 503.999.4617. I bought about 200 of the wads/tracer elements. It's hard to see the tracers on sunny days, since the tracer produces a whitish trail. During the day, it's best to have a spotter, but at night, you can clearly see the tracer round. It's especially fun to use them intermittently in Annies at nite. BobK
Tried some in the 60s, not very consistent, you could see the tracer go right past the clay bird without breaking the bird, then the next one the tracer would be 6-8 ft. off & the bird would break. They were kinda neat to watch though. Ross Puls
I purchased the tracer wads from the person "flybynight" was talking about earlier. I had real good luck with mine, like he said, a little hard to see in bright South Texas daytime, but at night, they look like a flare going out to the target. I have fun with them during night shoot-offs in our little local fun shoots (non-registered). The wads are a little "pricey", but work well when helping people "visualize" where they are shooting. Some will say the wads don't always go in the line with the shot, but most of the time, I think it is pretty much right in line with where you are shooting. My $0.02 worth Mike* (MH*)
I have some of the tracer wads for our high school team. I stopped using them for training as it was obvious they didn't always go with the shot. Maybe it was the way I seated some of the tracer elements. Hard to say. They're a great novelty item at night, but that's about it as far as I'm concerned.