I've used it off and on since the early 80's. I'm only aware of 2 differences...... it is supposed to now be less temperature sensitive, and it seems they don't offer much if any for sale. It is (was) great 6ppc powder. JME. WDwhat is the differance between h322 from the 80s time and now.i hear its the color of it but not sure about burn rates or anything else on it.also i see that shooters use n133 more now in the 6mm ppc.