Quickload lists burn temperature, but I believe it is the so called bomb test (Closed Cylinder) so may not apply the same in a cartridge. I have also read ball powders are less abrasive than stick and reduce wear from un-burnt powder in the throat. This might just be speculation.

Do higher velocities reduce barrel time and somewhat compensate for heavier charges and erosion?

If you want really cool burning powder use black powder.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli