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I’m planning on doing something similar with my 90s tourer.
Campag 10 shifter
Old Campag derailleur (pre 2000)
Shimano 10 sp cassette.
(I think I’ve got that right)There’s also an 8sp version using shimano derailleur and mech.
Bike is currently 8sp campag shifting over re-spaced shimano 8 cassette.
absurdbird-
Nice! That should work perfectly.
For my setup, Campy 10 shifter plus Exact Actuation derailleur is 2.8mm x 1.3 = 3.64mm. Shimano cassettes have 3.95mm spacing, so that's about 0.3mm "error" between sprockets, or less than 3mm across the whole cassette. It works pretty much flawlessly.
Your setup should be even better. Campy 10 shifter plus old Campy derailleur is 2.8mm x 1.4 = 3.92mm, so it's almost exactly right for a Shimano cassette. Now you've got me thinking!
(I got my numbers here, if it helps: http://blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/.)
OrkneyDullard
It does! Campy 10-speed brifters pull the right amount of cable, when used with an "Exact Actuation" Sram derailleur, to work with a 10-speed Shimano or Sram cassette. The brifter's cable pull varies very slightly across the gears, whereas the cassette spacing is constant, but the variation isn't enough to cause any problems. I used a 9-speed Shimergo setup for years, and this is just as good.
It's all done for cost - Campy shifters are cheaper than Shimano, Sram derailleurs are cheaper than Campy, and Shimano cranks are cheaper than either.