What is the weight of the 4mm Flobert bullet?

I think it's a half gram, which would be ~7.7 grains. Half a grain would be roughly 1/350th of a cubic centimeter of lead. I think even a mosquito would find that to be an peashooter so to speak :D
 
Back in the day....

Meaning the ending decades of the 19th century, very small caliber cartridges were popular for indoor target shooting (parlour shooting) and as dog deterrents for velocipede operators (bicycle riders).

Times sure have changed!
 
Found out that Flobert didn't invent the bullet (I guess O-man in the Whine Haus was right). Credit goes to Bernard Houllier. Flobert designed the gallery guns that he brought to the 1851 London Exposition. It was there that two Americans in attendance, Horace Smith & Daniel Baird Wesson, saw the bullet. Smith & Wesson brought the concept back and lengthened the case, added some powder and designed the 22 Short (called the .22 back then). Twenty years later at the suggestion of Stevens, USCC developed the .22 Long Rifle.
 
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