Don't fall into the trap of being paralyzed by indecision.
My new PacNor 18 twist barrel was at my door in 5 weeks. The new JGS 30BR Robinett V2 reamer took 11 weeks. The barrel was chambered and ready to go a week later. And the original 30BR Robinett reamer is still winning tournaments...that's what my 30BR barrels are chambered for.
100 pounds of powder to start with? Huh??? Forget about H4198 unless you've got a stash or you're a sugar daddy to the girl that runs the shipping department at ADI in Australia. That leaves LT30 and N130. It got simpler already.

Buy 4 lbs of each and let your barrel tell you what it wants. Get it from a single supplier that combines HazMat. Done. Shipping charges are shipping charges wherever in the U.S. of A. we live.
While you're worrying about ordering bullets, they're going out the door at the custom bullet makes since everyone has received their recent J4 jacket shipments.
Shooters build these 30BRs all the time with no angst or wringing of hands. Components that don't get ordered are already in someone else's hands.
Nothing to it but to do it.