If the wrap was insulating the bbl it would take some time before the heat could be felt on the outside surface of the wrap. It doesn't happen that way. The temperature change can be felt immediately after the first shot.
If the wrap was holding heat in the bbl steel after 12 shots, I think that the surface temp.of the carbon wrap would never cool down untill the steel liner temp. itself equlized with the outside temp. Then they both would cool very slowly.
It doesn't happen like thatwith the ABS bbl. It equalizes in about one to two minutes and then quickly cools down.
The other gun in the test had the bbl temp. rise for several minutes after firing stopped (149* @ 5 min.I think)before it started to cool. It was still 142* at 10 min.
In those same 10 min. after 12 shots and 770 more grains of the same powder down the bbl, the ABS bbl was near ambient temp. about 80* or so.
If I didn't believe in this I wouldn't have an ABS Inc barrel at Fiftys place right now for my own project.
When you get the pictures of the heat ready to post. Maybe you can post the name and/or model # or whatever of the gizmo that took the pictures. I am just curious as to what this thing actually is. Doesn't have much to do with hunting but it would help to understand what actually happened.
Home inspectors use them now to find where heat is escaping or coming into your house. Lots of folks use them in a dedicated manner, and charge a fee to solve your headaches quickly. Its common in your bigger cities like here in Houston now. The big boys in real estate are using them to point out problems to save customers money or drive the price up on homes they sell by showing definatively that the unit is tight. They are nothing short of amazing!
The day after this thread was started I turned on the TV to Discovery Chan. while I ate lunch. The show was about the making of the worlds largest cruise ship and its maiden voyage. All the time they were under power they had a man with one of these cameras looking into engines and bearing housings looking for problems. they found two bearings that were bad and showed the camera working. One bearing was on the propeller shaft inside a houseing that was huge, and the camera looked inside and gave an exact temp. reading. This allowed them to shut it down before any damage was done.
Pretty cool stuff to be able to calibrate to look through carbon fiber and read the S.S. bbl temp.---RHB---