If your bullets run a bit large and you are using modern thick-walled .38 Special cases which are dimensioned to increase bullet pull when loading lighter-weight, jacketed bullets, your reloads may exceed SAAMI max. cartridge dimensions. The correct answer to both your oversized bullets and the need to perform a consistent crimp with no mouth bulges is to use the Lee Factory Crimp Die.
This will size the bullet, if necessary, by compression inside the case, and it will profile the full length of the loaded round to iron out any bulges causes by mismatch of the interior case wall taper by the bullet base impinging against it. This is both the simple AND correct answer.