The two gunsmiths I know personally are old school and I doubt they even know how to use Email. Why don't you try the old fashioned way and give them a call? And if you want to find out what the bolt is made of then call Remington. The cost to weld the handle might be pretty close to what the rifle is worth.
I joined the circus to become a clown fighter. I now know 46 different ways to kill a clown.