u/Impossible-Green-862

I am only seeing 300 fps .44-40 "historically accurate" rounds when I know rounds with a much higher fps exist that I have seen on Youtube and want to find better ones rather than Cowboy Action target loads for hunting and more fun with target shooting and I don't know the names.

Is there a "modern round" that I am looking for?

I'm completely new to this caliber and need some help.