This video from InRangeTV, featuring Ian McCollum, provides an analytical and experimental comparison of 7.62x39 and 7.62x51 calibers in short-barreled rifle (SBR) configurations. The expert analysis reveals that while 7.62x51 loses significant energy in an 8.5-inch barrel, 7.62x39 remains more efficient, producing comparable or even higher energy levels from the same short barrel length, albeit with substantially less muzzle blast.
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