For one thing I never thought of 4350 as being fast. But I can see the OPs point. Fast powder has a fast pressure peak. Higher pressure=higher temp.
No, not nearly correct. The more powder burned, the higher the temperature--especially with double-based powders, though the temp difference isn't all that much compared to single-based powders.
Seems like there might be more data buried in the lab bomb test data (depending on what they collect).
It's just thermodynamics and the ideal gas law PV=nRT
It's really about heat calories released from the powder(which is tied to powder burned) and how much energy is in the powder. That might be something captured in the burn rate bomb tests...
The other factor is heat transmission. Different alloys/grades transmit heat differently.
Fast transmission is good because it means the barrel cools quickly...
You might have heat sensitive hands too...
