If they made an Enduron at IMR 4895 speed, It would become my "everything" powder.
You could give Alliant's new AR-Comp powder a try. A
rep for Alliant on another site claims AR-Comp is temperature stable, contains a decoppering agent, and falls very close to the IMR 4895 burn rate.
No personal experience with it myself, but I like the trend of newer, temperature resistant powders with decoppering agents added...