The Rem M37 is very uncommon on the smallbore prone firing line. I have seen actions in custom stocks. At the time the rifle was in production the smallbore prone rules were written by the Army, and the Army wanted people to shoot rifles close to the M1903, or the M1 Garand in configuration. Which is also why the triggers are so heavy: about three pounds. When American shooters were getting the stuffing beat out of them by the Russians in International Competition, the rules were relaxed and what you see in the early 60's are adjustable stocks, light triggers. Even so, the M37 had been out of production for a decade and never had as many built as, lets say, a M52. I wish I had a Canjar trigger, I would drop it in and see if it makes a difference on target. I have shot some good scores with my M37, in original configuration, this is a 400-32X I shot in competition at Wa Ke De Range, Bristol In, with mine, at 100 yards, prone with a sling.
The heavy trigger is a problem, takes too long to take up pressure and then you have to pay attention to not jarring things when it breaks. When I have examined others who are using Rem M37's, they always have a Canjar trigger in them, but unfortunately, Canjar has been out of business for a while.
I would say, check on Ebay and be prepared to pay a lot for a Canjar trigger.