JustinPo wrote:(if anything) is equivalent to anything else?
As far as you're concerned, nothing is equivalent to anything else. There are one or two powders that are interchangeable with another, but don't worry about it. In fact, don't even think about it. The downside is too huge. That there are some equivalencies are a matter of trivia to me and not efficiency.
JustinPo wrote:How can you tell what powder to get
JustinPo wrote:Do I research the powders I find listed within the Speer manual (#14) I am using as a general guide and wait till I find that powder
JustinPo wrote:where can I find good reviews, comparisons, and tech data on the powders? Is there a reliable resource, either online or in print that tells me about powder?
Most good manuals will have a couple paragraphs on each caliber and should give you a hint on which loads the authors tend to like or have had good luck with. You can also study your manuals (you really should own more than one) and cross check data. One thing I like to do is find powders that have a broad spectrum of charge weights that are within spec. I do not like loads that go from starting to max in less than a few grains.
If you are totally in the dark, I have had good luck googling "(insert caliber here) Chuck Hawks". He will usually give you a couple of powders to start with. (This worked spectacularly well for me developing a load for my son's .260)
You really should also pay a visit to the Oracle at GunStop. Be humble and be honest and he will be your friend.
And by all means, ask here for opinions. I would however, not ask for, or use any data you don't get from an original source (a manual). Ask yourself: have you ever seen Sam or Pinnacle give out reloading data? It's easy for something to get lost in transcription.