Just talked with Russ at Stiller. He said they ARE working on a rimfire "trainer" which is intended for just what we're looking for. It will be a repeater action with a 700 footprint, based on their previous non-repeater 2500X action, and it sounds like they are making an effort to match everything to the 700 as much as possible. This action might be 6 months away, it might be a year away - that's just the way product development goes. But I've been happy enough with my SPECTRE action that I can not wait for this rimfire trainer version to be available!! Add a KRG X-Ray chassis, a good (Lilja?) barrel, and a CG Jackson trigger, and it will be a great twin for my match gun.
Summarized, and cut directly from their "What's New" page (which I missed the first time I read through their page):
Rimfire
We have 2 versions currently in production.
The Lonestar was a single shot action that fits into a Remington short pattern stock. It had a PTG 40X replacement bolt. They are no longer being produced.
The Copperhead is our true center lockup style benchrest action with dual firing pins, Anschutz style loading ramp, center lug and a unique shroud/firing pin system for perfect alignment. IF you want the best 40X type of rimfire, this is it.
The 2500X is our newest rear lockup true benchrest action. Similar in features to the Copperhead. IF you want the best rear lock 52 Winchester type of rimfire, this is it. It is currently in testing phases.
The next and most likely last model will be a repeater version of the 2500X action. The 40X design did not lend itself to a repeater. The repeater will hopefully be out in early 2014. The 2500X action is much better suited for the repeater.