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and how Whitworth invented a machine to measure 1/1,000,000 of an inch.....
Here is one of my Whitworth bullets - made by Steve and Joe Polisar of Albuquerque NM
in a row of .451 bullets of different types,
#1 - 535gr Polisar swaged Whitworth bullet flat-base.
#2 - after firing.
#3 - Dyson 325gr hollow base, and
#4 - after firing
#5 - Metford paper-patch bullet, and
#6 - Lyman 535gr cylindro-conoidal bullet after firing from a Whitworth rifle.
Parker-Hale Whitworth rifle -