My 338 Lapua built on a Rem-700 action with the bolt stop moved to allow a COAL up 3.9" and fitted with a Seekins detachable box magazine that will hold a loaded lenght of 3.92".
It shoots pretty well also, 3 in this 4X6 at 975 yards
There are and have been a lot of 338 Lapua built on 700 action and I see no problem. I went with the Lapua because of the quality of the brass. I am happy with my decision
range it,check the wind, dial in correction, aim and only one shot