Originally Posted by Vapodog

At a minimum they are similar.....add to that AA-4350 as well.....

Since Hodgdon now distributes both H-4350 and IMR-4350 it's easy to get data for both and simultaneously. One should not substitute as though they were identical!

I have a sneaky hunch that AA-4350 is identical to IMR-4350 and that H-4350 is just very close.....but one would be gambling to assume that this is true!!!!....there is nothing to confirm it!!!

One must assume they are totally different powders until Hodgdon confirms otherwise.