No, they didn't produce one big batch. I've purchased and used several different lots of all three original Enduron powders--4166, 4451 and 7977--and they've all been easily available since shortly after their introduction three years ago, far more so than the Extremes. Which is how I've purchased several different lots.

Part of the reason is they're being produced in Canada, instead of on the other side of the largest ocean in the world, that has been making IMR powders for many years now. You might as well be afraid of not being able to get IMR4895 or IMR4350.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck