This may be a stupid question, and it has no doubt been ask before but here it goes. Can 9MM cast bullets be used in a 38 Special revolver? I was looking at the tolerances on the two bullets and there is only 0.001â€ difference between the upper limit of the 9MM and the lower limit of the 38 Special. Specifically: 9MM 0.355 â€“ 0.356 inches 38 Special 0.357 â€“ 0.358 inches In some cases I have seen tolerances of 0.0005â€. I do not think that cast bullets can be held to that tight of tolerances â€“ may be wrong however. Your comment would be appreciated.