In a word, yes.
I've been casting my own for some time now. Really got into it when I took up hand gunning about 12 years ago. Can't remember the last time I loaded a jacketed bullet for any of my revolvers. Most of my rifles see cast bullets too as many are older single or lever actions in uncommon calibers. It is so much cheaper to load with my own cast lead bullets than to buy jacketed.
I'm not too particular on my mix. I add tin or pure lead as needed to keep the Brinnel hardness down to between 12-14. This I measure with a Lee hardness tester. Been using a Lee bottom pour 10# pot for casting for over ten years now. I also smelt in a separate pot and carefully monitor the temperature to prevent Zinc contamination. A good themometer is a must. I buy any cheap pewter ware I find at the flea markets and yard sales for tin.
Most of my molds were bought used off of EBay and are single or double cavity.
I have two Lyman 450 bullet sizer presses set up, one which is heated. 75% of my sizer dies and top punches were bought used. And I make my own bullet lube.
Casting your own will save money in the long run but you must have a place to do it as it is a smokey, dirty process. But consider the fact that a pound of lead will give you over 40 158 gr bullet for your 38 Special/357 mag and you can see the savings potential even if you are paying 2-3 dollars per pound.
Lyman has a good booklet that covers the basics of both reloading and casting. Many of their reloading books have information on basic casting techniques too.
I cast and load for 30-30, 32 S&W, 32-20, 32-40, 32 special, 357, 38-40, 38-55, 45 ACP, 45 Colt, 45-70 and 50-70 as well as make 31, 42, 44, and 58 caliber round balls for my charcoal burners. Usually spend a couple hours on a couple days of the year making a couple thousand bullets which see to my shooting needs. I modified the stainless steel cabinet base of a old gas grill to use as a casting station. I can wheel it outside the garage on nicer days when casting. The top surface is a sheet of hardy-backer cement board.
The CastBoolit website have tons of info on the subject.
Cast Boolits
It's a good hobby.
John