I seriously doubt that the same named powder is the same as it was 50 years ago. Elmer Keith's pet 2400 load is apparently quite different with today's 2400.
Ever used IMR Blue in 44 mag.I've used the IMR Red, IMR Blue and Target. They work as advertised.
Ever used IMR Blue in 44 mag.
Funny. I just eliminated two dozen odd powders yesterday and reduced the inventory for my loading to 6 powders to cover EVERYTHING.
I agree, we don't need another powder.
I'd EXPECT any of the ones you use in .45 ACP or 10mm to work in 9x19mm. You may not need a separate powder for it, at all.