Hi' Luke,
Charles Ritz's family owned a string of prestigious hotels -- Ritz Hotels -- does that sound familiar? I believe he was of Swiss nationality; and he was the nylon monofiil brand, Luxor Kroic's, best advert. He also designed rods, and was universally respected as an angler.
If you are genuinely interested, I have a plastic laminate of his various formulae, which I bought from the late Dermot Wilson, one of our late, great dry fly fishers. No, you can't have the laminate.


But I have some printouts of lists that I typed some while ago. Pm me your address, and I'll mail you one.
Cheers, TC
PS If you decide to go ahead, you are in for a considerable amount of knot-tying. Hold on there, I have an A4 sheet before me that reads, ''Ritz Leader Formulae.'' They start at 23lb b.s. which was 0.45mm, and go down to tips of 7lb; 6lb;5lb and 3.75lb, the lightest of which was 0.18mm.
I'll bet there are readers asking how he managed to catch trout using tippets with a diameter of 0.18mm? Well, he did, and so did I.


I still have a few spools of Luxor -- as 'keepsakes.'
This is going to make a few of you squirm -- we used double-blood knots, as Ritz used them, and I can't remember having a problem with them; BUT nylon had better manners than its modern substitutes. Fact!!
Just had a thought, (Should be my family motto,

Using Ritz-s diameters, the butt lengths were chosen to give a good power transfer from line to leader, the modern equivalents would produce a pretty sturdy set of leaders; but many dry fly fishers would have no problem extending a 'heavy' 9ft to make a 12 to 16ft leader with a finer tippet diameter.
The lists that I typed are formulae for dry fly leaders, single fly. When I find the laminate, I know it has formulae for simpler 9ft wet fly casts.
Cheers, TerryC
PS To be honest, I haven't had hold of a leader that turned over any better than Ritz leaders, tied using Luxor Kroic nylon; but for many years, 9ft was my standard length, and nostalgia might just be having an influence; but I don't really think so. I was a better caster and fisher back awhile.