I really like 13-26 and 14-26 6- or 7-speed freewheels, but they can be pretty hard to find. Fortunately I have a pretty good stash of SunTour cogs, including 26T.
I run 47-38/13-15-17-19-21-23 (Regina America) on Capo
#1 , with an SRAM PC58 chain and Campag. 980 rear derailleur, and I can make the chain skate on the cogs if I mis-shift. It's pretty easy to avoid, but disconcerting that it can happen. With Japanese freewheels or cassettes I have rarely had this problem.
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069