Ken - That's really the tried and true. I've burned a LOT of IMR+H4895, IMR+H4350, Unique and 2400.
I've also burned a few pounds of W296, BlueDot, GreenDot, Herco, Bullseye, PB, 700X, WC820, H414, H380, W748, BallC2, IMR4227, IMR+H 4198, IMR4320, IMR+H4831, IMR4064, IMR3031, AA2230, AL7, Trail Boss, RL7, RL19, RL22 and maybe a few more. A lot of duplication and a tremendous amount of overlap.
Some I will try to not run out of and some I will never use any more of.
I've worked a lot of cartridge/powder/bullet combinations for which little or no 'exact' data was available. I look for similarities with cartridges for which data is available and determine for myself what I am willing to try and what looks "too iffy". I still have all my fingers, toes, and eyes. A point can usually be determined for a starting load with any given powder and bullet for a cartridge. The rest is "work up slowly". I have confidently found starting loads for my 94Winchester 32WSpl for cast bullets @ 183gr (for which no data is available) using Green Dot, PB, 700x, Unique, Bullseye, 2400, 4227, 4198, 4895, 4064, 4350 and H335. Some stayed at plinking levels under 1700fps, some went to hunting levels at 2230fps and brought down a cow elk.
Charlie, that's where you are. Not exactly uncharted water, but for sure little is published. You, sir, have two choices, and they are YOUR choices. You can depart from your journey and "stay within the published data" as will be recommended by many. For sure the safe and cautious route. OR, you can continue to bug AA for more pertinent data, researching the data that is available and determine where the overlaps are into what you want to accomplish.
This is NOT 'Beginner Handloading' - Do Not attempt if you are uncomfortable or lack years of knowledge. It is not learned overnight. There is a reason some bullet makers who list powder charges with their bullets do not recommend anything faster than AA#9 for their 250's and up in the 41mag and 45Colt. (only cartridges I've seen data accompany the bullets, though I'm sure others exist.) However, there is information available that can guide you to use stuff as fast as Bullseye, if that's what you choose.
The Very Bottom Line is "Stay Safe".