Hi there fellow forum members
I wonder if anybody here could help with my little dilemma which drives me crazy lately.
I have searched all internet in 3 languages for answer to my question with no luck.

HOW DO YOU MAKE MASTER RINGS IN VARIOUS SIZES FOR PRODUCTION (CASTING) PURPOSES?

I am relatively new to casting and all that wax carving, and what is most important... self taught, so there is nobody I can ask.
Should I make same ring in all sizes from wax and then make a mould of each of them? Or should I make 1 size, lets size size M, cast it and then stretch it to next size and so on? Or maybe should I make Z size and just make it smaller each time by removing metal in traditional way?
Is there any way to do that efficiently? How is that done by professional jewellers?

Would appreciate all help before I pull all of my hair out

It seems to me that it will take me longer to do 300 rings by lost wax & casting than doing them all by hand from scratch...