For all practical purposes, the same rifled blank would be used to make a barrel used for either a .38 Special or .357 Magnum. Most carbon steel barrels are made of 4140 or similar alloy, regardless of the intended use. The weak link would be the cylinder, anyway, since this is where pressure is highest and the wall thickness is the least on a revolver.
If you want to shoot off the box of .357s you have, fill your boots.
Unless it's a gain twist or squeeze bore - there are too many variables here, the gun was built for bullseye (not even PPC). The unknown is the bit that removes fingers.


















































