First, I want the story on that barrel. What happened?
The Lapua is general is not recommended in a standard (non-BA) action. The engagement surface on the bolt head becomes too narrow and at risk for being the weak link. Because the Edge head size is smaller, it leaves more metal in place giving a more reasonable margin of safety. I would go with a minimum 28" Shilen select match barrel. You will also need a magnum bolt head. Depending on how much the completed rifle will weigh, you may also want to consider a muzzle brake. My Edge weighs just over 15 pounds so I shoot it without a brake. I'm still breaking the barrel in but my first measured three shot group at 100 yards was a clover leaf of .337"
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