Check some of the barrel manufacturer websites. They havecharts giving measurements on their tapers. Most number them 1-7. 1 being the lightest.Number 5 isthe typical heavy/varmint contour. Most companies have Rem700, standard & varmint/PSStapers that closely match the factory contours.
But like Bigcountry said, it won't be an exact copy. It will have to be fitted to the receiver, headspaced,and the stock will need some fitting and bedding.
good luck