Another thing I have learned-use the load data for the exact bullet you are loading for.
I have found that copper plated bullets require a whole different range of acceptable powder charges. FMJ is not the same. The copper of a TMJ (copper jacketed) is much softer-and requires a completely different weight of powder. I just remember calling the manufacturer when I first leaded TMJ for 9mm. The charge for the same weight bullet was @ 1.2 grains more as a minimum.
Invest in some load data books for every bullet manufacturer you plan on using. You can't be too careful.
Yeah I might buy more! Right now I'm just loading 300blk and since powder is very limited, i didn't need to look for other data since there was only one powder available and luckily it was a known one that hornady tested.