I watched the first one. His main piece of evidence seems to be his ability to grab the 6Arc barrel at about the 20" length, so warm but not hot.
I would not attribute this to burn rate, rather to burn volume or mass. The 6 Creed is running ~40 grs of powder but the 6Arc is running ~30. That's 25% less powder to burn. AIRC powder burns tend to all be around, what, 10-15" of barrel, it is the shape and peak pressure that determines the energy put forth to drive the bullet and heat the barrel.
Also, the 6 Creed is running at higher pressure so this would tell me it's running hotter temps also.
Last, the CFE powder was designed with a copper inhibitor that tends to, as a side benefit, make a longer pressure curve at somewhat lower pressures.
Those 3 reasons would be more what I would think, go towards his barrel temperature theory.
I'd also add that, (I think) while the bullet is in the barrel, gas velocity is the same as the bullet's velocity pretty much. It's a closed cylinder so expansion occurs at pretty much one speed...
I would not attribute this to burn rate, rather to burn volume or mass. The 6 Creed is running ~40 grs of powder but the 6Arc is running ~30. That's 25% less powder to burn. AIRC powder burns tend to all be around, what, 10-15" of barrel, it is the shape and peak pressure that determines the energy put forth to drive the bullet and heat the barrel.
Also, the 6 Creed is running at higher pressure so this would tell me it's running hotter temps also.
Last, the CFE powder was designed with a copper inhibitor that tends to, as a side benefit, make a longer pressure curve at somewhat lower pressures.
Those 3 reasons would be more what I would think, go towards his barrel temperature theory.
I'd also add that, (I think) while the bullet is in the barrel, gas velocity is the same as the bullet's velocity pretty much. It's a closed cylinder so expansion occurs at pretty much one speed...