Rob.........it's funny you should ask that as the only one I DON'T shoot is the 66.........I have purchased or made brass for every single one but the 66, it's kinda funny but virtually every cartridge in the old Winchesters is based on about 3 or 4 cases that are still readily available. For the 95s I have made cases for the 38-72 and 40-72 by turning down the rim thickness and diameter of 405 cases, 35 WCF can be made from 30-40 Krag, 33 WCF and 38-56 can be made from 45-70, 40-82 can be made from 45 basic as can 45-90......The rest all are still available, like all the 92 cartridges, all the 94 cartridges, the 73 cartridges (which of course are the same as the 92). My 45-60 in the 76 can be made from 45-70. The rimmed 95s are all based off 2 cases the Krag and the 405 and the '06 of course, for the rimless.......the 86s are all from either the 45-70/90 and the 50-110........the 92s and 73s are from the 32-20 and the 44-40 in CF, the 94s are all based off the 30-30 case, or 38-55 which ever you like as they are for all intents and purposes, the same case. Even the 348 in the 71 is based off the 50-110 case.
So as you can see it really isn't that difficult to make them all into shooters and not have to risk using vintage brass.