9mm bullets are 0.355 diameter, 38 Special/357 Magnum bullets are 0.357 diameter, so you are talking 0.002 difference between them. There is enough load data around for the 38 special that uses light bullets in the 110gr to 125gr range, so using the 9mm bullets in that weight range shouldn't be a problem, however you may need a slightly heavier crimp to keep the bullet in place in the case. |