The Endurons are made by General Dynamics, but in the Quebec plant in Canada.
I doubt they'll produce an Enduron of the same burn-rate as IMR4895, since 4166 is so close. But then I didn't see any real place for an Enduron between 4451 and 7977!
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck