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How fast can a mag. of 20 shoot if it has a metal bar?

1 Answer

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The . 220 Swift remains the fastest commercial cartridge in the world, with a published velocity of 1,422 m/s (4,665 ft/s) using a 1.9 grams (29 gr) bullet and 2.7 grams (42 gr) of 3031 powder.
User KevM
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