Re: make a long range hunting rifle
I have a 7 mag with a 26" bbl and one with a 24" bbl. Krieger and Shilen respectively. 26-27" is the longest you'd ever need with a good barrel for 7mag.
I'm fond of the 5R style rifling for ease of cleaning, less fouling but ultimately, accuracy is the purpose. I'm also fond of the fewer groove barrels: 3 and 4.
My next 7mm bbl is on order right now from Shilen. But I would not hesitate to get one from Krieger, Hart, Bartlien, Obermeyer, Broughton, Lilja, Rock, or Brux.