The serious bullet caster, handloader and gun loonie will run up against the need for a tool, that isn't made or will cost allot of money to have one custom made.
The above mentioned guy, at some time will consider the purchase of lathe for his reloading shop. One of these fantastic machines and a good drill press, will make all kinds of wonderful things we need. They will last several lifetimes, if cared for and in my opinion are necessary tools for reloading.
Below is a pic of a hand bullet seating die patterned after the Wilson die. I needed a bullet seating die that would seat .314 cast bullet for my military Krag rifles. I took the chamber end of a highly pitted Krag barrel and turned it into a die. I took a .315 chucking reamer and rand it down the bore to create a bullet chamber for my large bullets. It works to perfection.
Old barrels are free for the asking and I have made cast bullet seaters for 30-06, 8 X 57, 30-30, 30-40 and 303 British. With these chamber type seating dies, you also get the significant accuracy benefit of straight line bullet seating.
Below is also a pic of my 1947 9 X 18 Logan lathe. No fancy tool posts or quick change gear boxes, just old school American iron.
You don't have to be a highly trained machinest to make tools like this, just a little common sense and an understand of how the lathe works and how to run it.