With regard to actions most lean toward the blue printed 700’s or plain Savage/Stevens. Choose either and you will be satisfied. With regards to barrels choose the best you can afford; better to spend too much rather than too little! Pillar bed the action as a guarantee of accuracy and get references on the smith you use to put it all together. Lots of people call themselves gunsmiths, you need a specialist and those (good ones at least) are not very common. More than anything else, the mating of the parts will determine the level of accuracy of the finished product. Also, “Tube Guns” seem to be the latest idea in stocking precision firearms, you might want to look into that.
My $0.02, Good Luck, I hope it works out well!