"A heavy barrel has more metal, and surface area, to spread out the heat of each round."
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<br>That's not the way it works, Amigo. The heavier barrel has a LOWER ratio of surface area to the volume of its steel, therefore it absorbs heat and dissipates it SLOWER than a lighter barrel does. This is a basic principle of physics, and I've calculated the surface-to-volume ratios for different weights of barrel, and they vary exactly this way, in every comparison.
