You're okay shooting those in a .357 mag revolver. I wouldn't worry about them in a .38 either. There's a lot of extra room in a .38 case and it's a low pressure round to begin with. The same amount of setback in a 9mm or .40S&W would be a much greater concern.
Does the bullet have a cannelure? If so, put the cannelure at the case mouth and don't fret the length.
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