Welcome to the forum!
Quote
"I assume I will have to open up the stock to fit the magnum contour, has anyone ever done this by hand? what type of tool can I use? I am a pretty talented guy and have experience with Cnc machines, My thoughts were remove a little at a time until I have good clearance from the barrel.
Are the 28 nosler cases going to fit in the stock savage blind mag, or am I going to have to modify it? is it going to hold 3 still or only 2?"

I use a 1" dowell and wrap sandpaper arround it to open the barrel channel
Not sure about the 28 nosler but the stagger feed 26 nosler I put together would only hold 2 rounds in the blind mag
Sorry, I can't help with your other questions, someone will chime in