Assertion: mm | /r/HasProperty | rifling twist rate
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Source sentences:
text: Bullets weighing 2.6 g (40 grains) or less are recommended for optimal use in 5.7×28mm applications, but the 228.6 mm (1:9 in) rifling twist rate (distance the bullet must travel to complete one full revolution) used in the firearms' barrels will stabilize bullets weighing up to 4.5 g (70 grains).