All the data for those is with powders designed for shooting lead, like blue dot, etc, these wads were made before Alliant's STEEL powder. This wad then became the MEC wad, it was the same NTC wad, Mec acquired them, and then they were called MEC12 wads or MEC122 wads, but they were the same wad.
You can still get ahold of mec and they'll send you free loading data for the old mec wads, which is what they are,although all the data in it is with blue dot, 800X etc. No Alliant steel data.
I then heard that those same molds were acquired and those same molds are ,or were, used to make Ballistic Products Multi Metal wad, Ballistic Products used to have a disclaimer not to use the Mec wad with their Multi Metal wad data, but i always have, as it's basically the same wad. They just have to cover their backsides from lawsuits, you know how that ballgames played.
So if you have a Ballistic Products "status of steel" manual , you can use the 2 3/4" Multi Metal wad data with those wads,and there's Alliant STEEL powder data in there.
Or you could sell them to me