Keeping the Grendel cool at the range

[kcb38]

Thanks for the responses!

For that particular test the guy measured the temp of the barrel at the handguard but I'm more concerned with lowering the temp at the throat of the bore.

If you did this test at the chamber you'd probably see a bigger temp drop because the heat transfer from the hottest region of the barrel will be faster than cooler areas. The question is though, steel being an excellent conductor, what is the temp difference from the chamber to the spot on the barrel he measured? That would tell you the difference in the rate of heat transfer.

Edit: wow my thermodynamics prof is probably turning over in his grave. Edited to say delta T would be highest where the barrel's hottest.