* A 6.35mm Italian carbine of WWII would equal a .25 caliber weapon.
* An American 8 inch caliber howitzer would equal 203.19mm.
Metric Measurement English/US Inch Measurement 5.40 mm .213 5.50 mm .217 5.56 mm .225 6.00 mm .236 6.35 mm .250 6.55 mm .258 7.00 mm .276 7.62 mm .300 7.65 mm .301 7.70 mm .303 7.92 mm .312 8.00 mm .315 8.40 mm .331 9.00 mm .354 9.50 mm .374 Metric Measurement English/US Inch Measurement 10.00 mm .394 10.50 mm .412 10.60 mm .417 11.00 mm .433 12.00 mm .472 12.50 mm .492 12.70 mm .500 13.00 mm .512 13.40 mm .528 14.40 mm .567 14.80 mm .583 15.25 mm .600 15.40 mm .606 16.40 mm .646 17.40 mm .685 Metric Measurement English/US Inch Measurement 18.40 mm .724 20.00 mm .803 21.40 mm .843 23.40 mm .921 25.00 mm .984 37.00 mm 1.457 47.00 mm 1.850 57.00 mm 2.244 60.00 mm 2.362 65.00 mm 2.559 75.00 mm 2.953 76.00 mm 2.992 76.19 mm 3.000 77.00 mm 3.031 81.00 mm 3.189 Metric Measurement English/US Inch Measurement 83.81 mm 3.300 88.00 mm 3.465 90.00 mm 3.543 93.97 mm 3.700 100.00 mm 3.937 105.00 mm 4.134 106.67 mm 4.200 114.29 mm 4.500 120.00 mm 4.724 126.99 mm 5.000 150.00 mm 5.906 152.39 mm 6.000 155.00 mm 6.102 180.00 mm 7.087 203.19 mm 8.000 Metric Measurement English/US Inch Measurement 210.00 mm 8.268 220.00 mm 8.661 233.67 mm 9.200 240.00 mm 9.449 320.00 mm 12.598 420.00 mm 16.535
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