Wow. Just shot my new to me 27-2 long barrel and I love it. I'm really not recoil sensitive, but could tell the difference between it and my 4 inch Highway Patrolman. What really surprised me was how much quieter the long barrel is. However, I noticed how it was getting much hotter than the 4 inch. I was only shooting .38s, but it seemed to be getting very hot. Is this what you all have found with the long tubes?

Unfortunately the heat equation is symmetrical, more metal takes longer to heat up, but it also takes longer to cool down, so yes it does get hotter with rapid shooting. With an overheated barrel and cylinder, its hard to find a cool place to hold all that weight out front other than a regular two handed grip.

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Science plus Art

Well more time in the barrel and more surface getting rubbed as the bullet turns down the barrel would create more heat. But, there is also type of powder, type of bullet and jacket. Warmer day means warmer gun as it won't cool as fast.