Expert, Knowledgeable, etc..
Expert gunner.
Swords & guns.
pullicologist
An expert at table talk is called a deipnosophist.
Horologist
A mathematician.
Horologist
Horologist
Toxicologist.
The higher level you are the more guns you get
Sharpshooter is a higher class. Expert is higher still.
probably but i would stick with grease or ask an expert