The specific head of brass is 2X that of steel. That means that your brass case require 2X more heat energy to raise a unit mass 1 degree (e.g., Celsius). Brass and steel have have similar density, so a steel and brass case for the same cartridge would have roughly the same mass.
So when a brass case is ejected from your action, carrying with it the heat energy from the fired round, it should be actually cooler than a steel case. But in actual practice, I believe that both are equally hot, meaning the brass case is carrying more heat away than the steel case.
Brass is better here in that it ejects more heat energy away from the gun. What about plastic cases? They carry away almost no heat energy when ejected, letting the gun get very hot indeed. VERY BAD FOR THE GUN!
So when a brass case is ejected from your action, carrying with it the heat energy from the fired round, it should be actually cooler than a steel case. But in actual practice, I believe that both are equally hot, meaning the brass case is carrying more heat away than the steel case.
Brass is better here in that it ejects more heat energy away from the gun. What about plastic cases? They carry away almost no heat energy when ejected, letting the gun get very hot indeed. VERY BAD FOR THE GUN!
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