As the cal gets bigger, casting gets much more relevant.
I shoot a Win94 trapper in 45LC. I make a GC water quenched 325gr FN monster slug. Simply not available commercially.
I am going to start working up my 308BR cast rifle. Again, the slugs I make are simply not available over the counter.
For HG, that is a toss up. If you shoot high pressures and lots of it, you would be better off with plated or jacketed bullets. I have not had much success in the 9mm bore.
However, if shooting 40S&W and larger bores at moderate to low pressures, cast bullets are ideal.
In my 45ACP, the bullets never lead, shoot better or as well as any commercial product, alot of fun. In my 40S&W, getting borderline as even with water quenching, leading is just there so have to be careful with loading. They do shoot and function in my XD very well and keep costs kind of down.
I make all my pistol bullets in a 6cavity Lee mold. They have paid for themselves in the first afternoon used. You can make about 400 to 800rds per hour. Tumble lubing takes a few minutes per thousand so time invested in not severe.
It opens up a whole new section of the reloading world and allows you to explore alot of history and surprisingly, unique technology.
Jerry