The headline is incorrect, he was not hunting. He was carrying a rifle openly which is quite legal as well as a concealed .45 for which he had a valid concealed carry permit.
His son made a video that you can see here:
The deputies do appear to be out of line and acting improperly if not illegally. Difficult to say what may have transpired before this tape.
To be clear. . .
They are not deputies of Bell County.
They are police officers for the City of Temple.