Which gun? A bullet fired from a rifle, such as the 1903 Springfield, K98 Mauser or SMLE can travel about 2600 to 2800 ft per second.
F.A. 43 bullet is a .45 caliber ACP bullet most likely from the Korean War or World War 2. The F.A. stands for Frankford Arsenal.
Yes
me
No
There was not a bullet proof vest issued in World War 1. There were some vests with steel plates in them that could be purchased by the individual. The flak jacket was developed in World War 2 for aviators.
ebay
About 20 cents.
Hell no
Assasination of Franz Ferdinad?
Tank.
a bullet to the brain or cut off limbs
Most tanks in WWI could travel between 2mph to 8mph on flat land. Far slower in trenched areas.