By the time you modify that standard bolt face Remington 700 to a magnum and rechamber the barrel your well on your way to buying another rifle. I would look for a 270 wby in another rifle to try or buy a 7mm rem mag 700 and rebarrel or just leave it a 7 mag and call it a day.

Figures don't lie, But Liars figure
Assumption is the mother of mistakes