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Yes the next question is that heat comes through from any bullet but just maybe the composition of the mono metal bullets does not channel heat away from their surface as efficiently as lead core bullets may.

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Of all the materials used in bullet manufacturing, lead is the worst conductor of heat. Brass/bronze is about three times better and pure copper is the best at about 10 times that of lead. Lead core bullets would therefore be worst at channeling heat away from the barrel wall and copper the best. There is a simple experiment to verify this fact. Measure the temperature of the chamber area of any rifle. Fire five shots at 1 minute intervals and measure the temperature 1 minute after the last shot was fired. Start with a completely cooled rifle and use different bullet types.

http://www.engineeringtoolbox.com/thermal-conductivity-metals-d_858.html

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