I know my screw needs to fall .700” in 1 turn.
No A Ferguson rifle's screw falls 1 inch in one turn.
Shortest-cheapest- smartest route is to Order up a set of parts form TRS- really go this route. If you want to learn you can always turn a replacement screw out of bronze to fit the action they send you. If you want to preserve the money you invest in the parts set, pony up another equal or greater amount and get one of the builders on here who have experience with the #513 TRS kit to build it for you. Or Talk to Ernie Cowan and see if he is still building them.
If you are serious about doing it your self Read/study Screw Cutting on the Lathe by Martin Cleeve. (and then read the Multi start section a 100 times more)
Get Dewitt BAiley's book on Flintlock Military Rifles it is the best source of data on the Ferguson AND some much better looking breech loaders. You might even decide a ferguson is too ugly and crude for your taste compared to the 1730s Utrecht gun.
Order a barrel from TRS they are the only ones with something that will work off the shelf and maybe the only ones with the deep grooves needed.
Search on here for the .50 cal ferguson sporter thread. Pics are gone but the authors description of how he went about it is simply priceless for we newbs.
Studying the Ferguson is a worthwhile endevour just do not expect that anything is going to come quick or easy. I started my build from scratch with no machine knowledge etc the day my wife started med school- she will be done her project before me. But I aint too bright or focused so do not let that discourage you.
Have fun with it.