What cartridge is this a go to powder for? I have about 7.5 pounds. I bought a 8# jug about a year ago thinking it would be good in my 270 Win. I've tried it with several bullets and it hates this powder.
The IMR 4831 is a slightly slower burning powder than the IMR 4350 primarily for the heavier loads like 330 gr and up.
Myself I have not seen it listed in any of my reloading data, and I use a lot of IMR powders like 4350, 4060, 4895.
According to IMR it is used for the heavier loads in the magnum lines and the Win 270 is not a heavy load magnum. I am assuming it is close to the 4350 powder but slower burning and you may have it with the 4350 is why you purchased it. I encountered a similar situation with my Win 94 when powder became so scarce. For over 30 years I used IMR 4895 in those reloads and when I couldn't find any I researched the closest powder I could find, which at that time was the IMR 4064. I had a little better luck than you did though. My Win 94 shooting 170 gr using the 4064 performs better,(at least my opinion), than the 4895 and easier to find, so I've been using it since.
I use the 4350 in several calibers (WBY .340 Mag, Ruger 375, Browning .243 Mag) and am happy with it
in those calibers. Although, the 4831 may perform better in the two larger magnums since I am shooting 300 gr Sierra Match King in each of them.
Hope this helps and good luck.