Is a M-70 SS a good candidate for custom work? Would it be a good idea to open up the bolt on an .06 to magnum proportions, or will that create problems with reliability? I just wanted to upsize the caliber to .300 or .333 mag if possible since I am a one gun hunter. Also I was wondering if it's a good idea to buy the barrel already short chambered or leave it all up to the smith? (which I have not located yet). I don't need a match grade gun, just decent accuracy and absolute reliability. Thanks.