It is a combination of both. But mostly due to the quality of the materials used in the Savage. The barrel, action, and bolts, are the exact same material you will find on their centerfire rifles, 416 Stainless and 4140 Chrome-Moly. That material found in CVA are 1137L/1137LR or 1140L/1140LR, which is a much softer grade steel. While the 1137 & 1140 steels machine beautifully, they don't have the tensil strength and will not stand the the pressure that 4140 & 416 will. Also the breech plug is 4140 (not 416 SS, because stainless on stainless can gawled and become stuck) and the designed of the breech plug. The vent liner, with it's tiny .031" orfice, also contains much of the pressure by throttling back the amount of pressure that bleeds back toward the rear.