The Elite Hunter is an upgraded version of this trigger. Difference being that we upgraded the sear engagement to be internal (one less adjustment), we upgraded the sear and sear spring pressure to be just as compatible with custom and clone 700 actions as it is Remington's and we labeled the side of the housing for over travel and pull weight, making it much more user friendly:) Pull weight range is the same between both models.
Yes, these triggers should also work in the 40X as it is almost identical to a Remington 700.
Those should accept a standard Remington 700 trigger as well.
From everything that I have found you are correct and Remington 700 triggers will also work in the Remington 78 actions.
No, it will not fit.
Yes, that model is adjustable.
This will fit both CDL and BDL models.
This is the normal size trigger, you can find the thin model here: https://www.opticsplanet.com/timney-triggers-remington-700-thin-trigger-w-safety.html
The Calvin Elite variations feature more advanced finishing treatments to increase durability and lubricity, they also are available in lighter pull weights.
510 is right hand, black.
511 is left hand, black.
512 is right hand, nickel plated.
516 is left hand, nickel plated.