Here's what I would do:

Order a new steel triggerguard/floorplate assembly from Sunny Hill Enterprises for your Model 700. These aren't cheap, but they are of the highest quality, and they won't come open under recoil.

www.sunny-hill.com

Take you rifle to a good gunsmith and have him inlet the stock for the new part, and finish to match the rest of the metalwork.

Factory rifles in dangerous game calibers generally do not become true dangerous game RIFLES without some work.........

AD