Hello all... Been thinking of a 404 Jeffery for a while now. Don't nesessarly need one, just want one. I have a mint doner rifle... A Winchester M70 in 416rem. Has anyone done this convertion before? What mods will be required to rebarrel it and make it feed properly? I hear that the perfect doner would be a 300rum but dont have one of them kicking around. Thanks for any input!