When searching for an action to build my 338-06 with, I came across an action meant for cartidges a little larger in size. It was the model 1999 Montana Professional Hunter with a bolt face of either .534, .604, or .648 made in either 415 stainless ot 4140 chrome moly. Since this large double square bridge action is still in the "development" stage, the price is US $525. Follow the link to check it out. www.montanarifleman.com