9mm is cheeper cause it's a smaller round.
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.223 Calibre although .223 Will fit on a 5.65 mm, a 5.65 mm Will not fit in a .223 calibre chamber.
40 mm = 1.575 inches 40 mm = 4 cm
40 mm = 4 cm
Since there are 1000 mm in one meter, then 40 mm is 40/1000 = 0.040 meters
No because 40 meters is equivalent to 40,000 mm