Use Winchester SilverTip .38Spl STANDARD VELOCITY data. The HE is similar to the old SilverTip and is designed to expand to about 45 caliber within the FBI standard 12-18” at standard pressure. It will need the lower end Winchester JHP data for use in .357Mag. It’s a terrific bullet for snubbies, especially the older Detectives, Cobras, and Chiefs Specials.
HTH
