Not so much barrel length, but making sure your load has burnt ALL the powder before the end of the barrel. I had a couple of Mosin Nagants, a Polish Carbine (20") and a 26" 91/30. With factory ammo the flash and bang out the front of the Polish carbine was amazing...but the extra 6 inches of barel on the 91/30 meant that it was more like a 303 with no flash and a much reduced noise as all the powder was burnt in the barrel. By using a faster burning powder I was able to get the most out of a similar rifle with an 18 inch barrel that uses all the powder and keeps the Bang to a minimum.
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