HI, thanks for using healthcare magicTinnitus
is the perception of sound in the ear when none is present. Different sounds can occur but buzzing is one of them.
There are different possible causes but exposure to loud noises such as the shooting is one of them.
The prognosis varies, it can resolve on its own, this can take up to a few months in some cases or it can be associated with permanent changes.
You should consider visiting an ENT doctor for assessment.
I hope this helps