That looks interesting. Is the interior web depth that consistent? I have to assume it needs to be all one brand, since that dimension varies by manufacturer.I ran across a guy from NH while shooting at the Wilson Matchs in the late 70s that came up with a unique method of triming cases, it works its fast and its accurate.
Its based on a rod with a cutter that trims and bevels the case at the same time. The rod is the same size diameter wise, as the mouth of the case, the cutter had a V notche that is adjustable via a slot in the rod. An alen head screw tighents the cutter. You run the rod in the case until it bottoms out, then slide the cutter to the proper lenght. You put the rod in a drill press, turn it on, then run the case up until it bottoms out and your done. Just that fast, slide the case over the rod until it bottoms out. You can use a collor over the rod to keep chips from flying around but if you wear safty glassed you can get by without the collor.