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Dremel, I see your points, but regarding the shed of heat from the thin barrel versus that of the fat barrel, I'm not sure you are correct. Consider that the thin barrel has less surface area, but it will have a higher surface temperature. I'm thinking that the higher temperature will cause a more rapid heat loss than the lower surface temperature of the fat barrel. Once upon a time, many years ago when I was a working Process Engineer at an oil company, I actually used to do calculations of heat loss, surface temps, and temperature gradients across metal pipe walls and even smoke stacks. That's out of my skill set now. And I will admit that there were many times when my preconceived notions of the final answer were 180 degrees from the right answer when I finally finished the study.
And Bart, sometimes things are not so difficult to grasp as they are to accept. And I have to wonder why you would have a heavy barrel on any rifle, if it matters not to accuracy.
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