I would like to add; that in choosing a barrel, the smoothness of the barrel is also important. As I recall, the term, check "8" is about as smooth as it can get.
There is an outfit in SD, I think, that makes accurized synthetic stocks for Remington in their Model 700 SP. I had him over to the Law Enforcement Training Center here, and he had some darn fine rifles.
We tested several different calibers for our counter sniper program, he even has a take-down model, we were impressed. The take-down model is available in a several barrel and caliber set. This one really impressed me.
He also will fine tune and make barrels. I understand he will do Mausers and most all rifles. The name of the company, if my memory serves, Something Presision or Presion something. The owner's first name is Tom. Again if my memory serves, he is a Bench Rest Champion from some time ago. Hell of a fine fella. Doesn't try to smoke you with trivia.
Wish I didn't suffer from CRS (Cant't Remember Stuff)
The frustration comes from marrying the ammo with the gun. It can be long and tedious. Finding the right combination of Powder, bullet length, weight, and length of barrel takes time and of course money. However, if you want to have the best and be the best it is time well spent.
HJN