Bill....you're correct in that Canjar is out of business. Maynard Canjar got old and shut the business down a few years ago. Some of his single set triggers are still in the pipeline, as I've found one for one of my No.1's, another for a Sako Vixen not too long ago.
On my No.1V below, I floated the forearm wood, glassed a good support for the tenon hanger (you must remove wood), gave micro clearence around the action and installed the Canjar single set trigger. Still no BR rig, but it does quite well in the rat patch:
I don't shoot much paper, so don't have a bunch of bragging groups to post, but here's a ten shot group from the No.1V during some chilly temps while fighting a pesky wind while preparing for rat season some years ago:
Not sure if those flyers were due to the tricky wind that day, or just me not paying attention, but you get the idea....these rifles can really shoot when dinked about with a tad.
Humm....maybe I should Photoshop this baby and do some creative cropping.......
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Naaaa, you guys all know I can't shoot that good anyway.
Bill, another thing you can try that has worked for me with these rifles, plus the Browning M78 single shot, is to drill/tap the tenon hanger, install a setscrew to bear against the shim so you can vary the tension. By doing so, you can tweak the tension to find the 'sweet-spot', and watch your groups shrink (or grow) accordingly. It's an old trick Frank deHaas used for many years (Master Riflesmith, author of Single Shot Rifles & Actions, his son Mark, USMC, was responsible for some of the design of the M40 in 'Nam). Good luck with the rifle, let us know how it goes.