I still reload lots of Federal paper, have tried the 'replacement wad' recommended (Red 8), but it a little too high for 1 1/8 oz. loads. Would be interesed in purchasing any 12C1 wads, they are hard to find since Federal quit mfg. them. Let me know.
I was talking to the Alliant Powder rep at the North Carolina State shoot this year and he suggested using the 12C3 wad in the Federal Paper Champion hull. I have quite a few but I have not tried this wad. I use the replacements with good results.
Actually the 12S3 is about the same height as the Red 8 and its a tight fit for 1 1/8 oz, so I don't know how Federal crams it all in there. But most reloading manuals list the good old WAA12 as a suitable wad for papers with 1 1/8 oz, and I have found that they work quite well. I know those wads are for tapered hulls and all that, but they have a deep enough gas cup that they seem to seal quite well in the papers.