Re: Adding weight, balance
Ive used the lead shot and epoxy method before and it works well. What you might consider doing is covering the area where you are going to add weight with a thin layer of grease, or bedding release agent, add your weight and epoxy and let it cure. This gives you a chance to try the rifle with weight in place, if its too heavy or don't balance in the place you like it, you can easily remove it, cut some off and try again. Works well for the buttstock, and the forend. When you get it how you like it, clean grease, and put down a thin layer of epoxy and youre done.
I like most of my rifles to ballance at the front of the action, heavier rifles that will only see bag use, a little further forward.