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If you starting looking carefully at military bolt action rifles, you will find that they generally all fall into one of three categories:
Rifles: 30-32 inches / 760-810mm Short Rifles: 24-26 inches / 610-660mm Carbines: 17-20 inches / 430-510mm
How did these different standard lengths come about, and why are the Italians and the Russians different? Let's have a look...