It still shows up on IMR's website:

https://imrpowder.com/imr-4320/

Hodgdon maintains separate sites for IMR, Winchester, Hodgdon and Goex powders, I suppose for rational business reasons. (or perhaps not)

'Four legs good, two legs baaaad."
----------------------------------------------
"Jimmy, some of it's magic,
Some of it's tragic,
But I had a good life all the way."
(Jimmy Buffett)

SotG