Agreed that both charts are fucked up and made to target a specific audience.
Take these charts for example, in a comparison for best load for bear:
View attachment 8391002 View attachment 8391003 Again, is it a fair comparison? That depends upon what you are trying to accomplish.
In the above example, once again the .44 mag load is using 10 more grains of powder to push a bullet that’s 100 grains heavier. Is that useful information? Yes. Is it a direct comparison? Hardly.
What’s missing from this one is that the 10mm is usually carried and used in an autoloader and the .44 magnum is usually carried and used in a wheel gun, with the notable exception of the brick that’s made by Magnum Research.