872 is about a sub for 869, which is the go to powder in my 26 Nosler. I use those two interchangeably in that round. Now, there couild always be lot to lot variation, so proceed accordingly. It just so happens that my lots of 869 and 872 perform exactly the same with same charges, same bullets, same velocities, same round. Your experience may or may not be like mine.
872 reportedly will do about what H-870 will do. I've never used 870, so I'm going by what I've read.
I have some vintage H-4831 that still smells good, shoots good. It's got to be 60 yrs old or even older. As long as they're stored and cared for properly, it can be surprising how long some of those old powders will last and still perform.
Buy 872 at this site from Jeff Bartlett. Jeff knows his stuff and is easy to talk to. Give him a call. http://gibrass.com/