Swapping data for IMR 4350 and 4451?

[typetwelve]

That I can tell, and after all the reading I've done...that I can see, IMR 4451 and 4350 are darn near the same thing. They look alike (yes, I know this isn't everything), They are right next to each other on the burn-rate chart, and according to articles like this one here:

Rick Jensen Temp-Tests New IMR 4451 << Daily Bulletin

Shows that same for same, with identical charge sizes in the same round type, they performed within 50fps of each other.

I'm loading 7.62x54r with 174 Sierra Match King projectiles and IMR 4350 successfully. I only have one lb, though. I do have a lb of IMR 4451 and would like to use it despite not having any load data for it.

Lastly, I've sent an email to Hodgdon asking this as well. I'll update this if/when they respond.

[rockquarry]

There's probably data in the Hodgdon book if you can find one nowadays.

[elpac3]

They are very close but not exactly the same. For the .270 with a 130 grain bullet Hodgdon lists 56 grains as top end while they list 55 grains as top with IMR4350.

I have loaded with both and get a couple of FPS more out of the 4451.

Hodgdon has loading data on their web page which can be consulted