I don’t understand why people come to an Internet forum first when looking for load data.
ALL of the powder manufacturers have load data available.
I STRONGLY disagree. Why reinvent the wheel? Why burn $200 worth of powder and go through hundreds of bullets experimenting with loads when others have already done the research. Every single load that I currently use was " borrowed" from other people.
I wouldn't ever simply take someone else's suggested load and blindly use it. But if I'm looking for a good load for 30-06 with 180 gr bullets I'm going to ask what others are having good luck with. If I find a lot of people getting good results with 56-58 gr of H4350 then chances are good that I'll have good luck with a load in that range too.
But I'd 1st confirm that is a load listed in at least one manual. Then I'd start out a little low and work up. Which is exactly what I've done and settled on 57 gr.
I'm not saying that is the only good 30-06 load. But that is one that an awful lot of others have had good luck with. There are other combo's that I came across that were working for other people too, but for a variety of reasons that is the one I settled on. If H4350 were to ever not be available then I have alternate ideas that I could use.