What Ya'll know about Alliant 4000 MR ?

[shooting on a shoestring]

I ask b/c I see it on most the internet powder houses, listed fairly cheap. Seems like a low demand for it. Makes me wonder if there's a reason nobody wants to shoot it.

[texassako]

It is a powder for large capacity cases. MR=Magnum Rifle in this case. I see magnum powders available most places. Probably because of their limited use in cartridges that are shot a lot.

[shooting on a shoestring]

Yeah I get that its a slow burner. Looking at the Alliant site I see it looks good for 243, 25-06, 30-06 and a few magnums.
Anybody know what the kernals are like?
Anyone actually shot any?