The subject of 2400 being " hotter " is a subject of some controversary . I read , from time to time that very statement yet they never provide proof to back that statement up . They will say something like " I read it in a magazine , somewhere " , or " well I just know that it is " .
But WHERE is the proof ? Truthfully , for them it doesn't exist . I decided to settle the myth so I called ATK , the receptionist asked " What division please " ? I answered ," powder division " . I was connected to vp , I don't recall his name at the moment , but rest assured this call did take place . I asked him simply , " is the newer 2400 hotter than old 2400" ?
He answered , " not to my knowledge " . He then went on to explain that gun powder manufacturing is tightly controlled by the gov't and you can't just start playing around with the burn rate on a whim . If you do change the burn rate on 2400 they could NO longer call it 2400 , instead it would have to be " 2500 " or " 2300 " etc .
He said that reformulation doesn't mean changing the burn rate . They had done that to several powders to simply get them to burn cleaner , unique , red dot , 2400 etc .
A very knowledgeable gentleman on another forum went to Washington State , to a test facility using very sophisticated equipment to test " Old 2400 " vs " New 2400 " . I haven't gotten his permission to list his name so we will just refer to him as " He , or His " . He tested them for both pressure and velocity on a test barrel . His results showed that the " newer " 2400 was actually a trace SLOWER in burn rate than the old bottle . His velocities were actually just a tad lower , consistently using different loads .
This could be accounted for as there is a very small margin in burn rate allowed in the production of powder . If the bottle of the older powder was just a touch faster and his new powder , just a tad slower but both still within the allowable margin then it is reasonable to assume slightly different pressure and velocity between the " old " and the " new " .
I despise internet myths . I pursue the facts , hence the reason I called Alliant to get the real truth . You can make up your own mind as you please on this subject . I have made up mine .