Shooters, nozzles, squirters???????????
That's what it is. The accelerator pump nozzles that squirt gas into the carb as you open the throttle plates. That's what keeps it from going lean as the throttle is opened. And when it goes lean, it backfires. I think that is what you are experiencing. Not enough fuel in the accelerator pump action.
The jets sit in the bottom of the fuel bowl. Different animal.
BTW, shooters must be a term used in northeastern Ohio, only. Only place I have ever heard the term. But you got to understand that those people live on the shore of Lake Erie. Sometimes, in the winter, they can't get out for weeks. I think there must be a lot of inbreeding up there