hey....no one ever said the firearms industry has to make sense.....Newbies can become swarmed over just understanding cartridge nomenclature...some named in millimeters and then the numbers aren't numerically correct...some named for caliber and powder charge, some named for date, some named for their designer.....

We can be careful to follow a set of rules to correct this best we can.....just another reason to treat all powders as different until you know for a fact that they are not.....I also wouldn't be too sure if I'd believe the internet on this either.....

If one goes to Hodgdon's website and reviews the burning rate for these powders he notices that IMR and H-4831 and not side by side implying that there's a difference in burn rate....other powders like IMR and H-4350 are together which implies that they are at least not too different and might be identical.....how good is your memory???

The more interesting thing is that Hodgdon now owns the IMR powder company and one would hope they would kill the IMR powders that are duplicates of their own brand.....any bets?????.....