In trying to understand the naming of the new IMR powders, I put on my sales/marketing hat to analyze the situation. Based on the (real or perceived) scarcity of many of the traditional long standing "color dot" and associated powders, my gut tells me that Hodgdon smells blood on the water and sees the opportunity to pry a portion of that business away from the competition.
Or call it payback if you will for the introduction of Clay "color dot" powder. Hodgdon's customer base is heavy on the individual handloader, the other supplier(s) is the opposite, heavy on the commercial ammo makers. In the good old days of 2013-2014 powder shortages, the suppliers were successful in blaming the shortage on "hoarders" but that train has long past pulled out of the station leaving some of the suppliers with no viable excuse for the absence of product. The fierce brand loyalty that handloaders and gun owners historically exhibit does have it's limits.
Hodgdon, for all it's warts, understands that most handloaders, when they need powder and cannot find their favorite, will find a close substitute. Once they work up loads with the substitute, they will continue to use the substitute (as long as there is at least a feeling that it will remain available)
*. I really don't think its any more complicated than that although I might have a minor detail or consideration wrong.
I would love to see some standard either in names or a coding as it would be nice to know what powders really are without having to look them up in manuals.
You will never get away from consulting published sources for load data and you shouldn't even consider doing so. If, 10 years from now find yourself still knee deep into handloading the bookshelf closest to your reloading bench will be bursting with manuals and data books with copyrights spanning 50+ years.
* ON EDIT: In my situation I have spent a lot of time working up loads in 9mm using American Select. At one point in 2014 there was 8+ pounds of it in my bunker. Down to about 1 pound now.
In the last year or so I have seen this powder in the stores, at gun shows and on-line very few times. I'm having a difficult time convincing myself that I should continue to search for a product that is difficult to locate and has numerous viable substitutes.
American Select was a budget powder but in the overall scheme of things, handgun loads use such a small amount of powder that the cost per round between the least expensive and most expensive powders amounts to about 1 cent.