OK, I am aware that actual sizes are different than indicated sizes. I thought you may have been referring to actual sizes. The 9mm is slightly smaller than .357 and the .38 family varies in size just slightly larger than the .357 but under the an actual .38 measurement. Way back in the EARLY 70's, when we were teens, a friend and I did a lot of target shooting. At the range we shot mostly .22, .38 Special, .357, AND .45. Because the .357 was a "cruel to the shooter" gun we often shot less agressive rounds through it. Typically we went through a couple hundred rounds weekly. We often ran wad cutter .38 rounds through the .357. We spent hours melting down wheel weights and pouring our own wad cutter bullets. Hot Job!