Don he is still young and dumb so to say. Keep him away from gunshots till he is at least 2 years old. Then the only gun shots he should hear should be while hunting, and hopefully a critter to fetch. My dogs don't like it when I practice shooting, so I let them in the shop before I start. It is quiet enogh in there they don't seem to mind.
But when hunting they could care less of a shot rings out. They know there is a reason to shoot, and they know why.
Don't ruin a young dog by forcing the issue. Wait till he is ready to hunt to do the shooting, and not a lot of shooting at that, just enough to put game on the table. He will get the idea.
Regards, Kirk