I shoot ball powder exclusively in a 270 Allen Mag (since I think I've notices that stick powders are more abrasive than ball powder) I only used stick powder (ssc) for light bullets (130-150 class) as my first attempts w/normal sized stick powder caused bridging at the neck. Pressure when sky high with RL-25 and the like.
Using US-869 there appears to be some temperature sensitivity but my work arounds include not shooting @ temps above 65*F if loads are not chilled, carry loads in an ice bath in the summer and in a warm pocket when hunting.
I don't think US-869 is nearly as temp. sensitive as RL-22. I have no experience with other ball powders.
Note, I do my long range hunting mostly from a 'hide' thus cartridges are not chambered until there is a shot.
For walk and stock I've considered a summer load and a winter load but I'm skeer'd of confusing them.