Sorry I'm so late in answering your question. The double base powders, like 560 and RL26, do have higher burning temperatures than the single base powders. But, like many things, that information is only worth something when it's put in the context of real world use. I saw an interview with a technical guy from Vihtavuori, who was discussing the technical aspects of single vs double base powder. He gave the flame temperature difference between the two powders. His conclusion was that the difference in temperatures was insignificant IF THE FIRING RATE OF THE AMMO WAS NOT RAPID, AND FOR EXTENDED STRINGS. He used the example of F-Class as a shooting discipline that you would not want to use the double base powder. When you look at predator hunting, with the relatively small number of rounds fired, low ambient temperatures during hunting season, it would be virtually impossible to detect the difference in barrel erosion. I have two .22 Creedmoor rifles. One I have shot mostly VV N-160 in, and the other has been fed RL-26 and N-560 exclusively. I can't tell the difference in bore erosion at the same round count with the bore scope. I just don't worry about it.
