I checked the Lyman cast handbook just a sec ago and they show several loads with 148 grain wadcutters going 950+ ish...same with the Lee handloading book. Haven't checked Hornady book yet but will do and get back with you.
Lyman lists hp38 (231), Tite group, and bullesye as best powders for not just wadcutters but 38 spc in general across all projos cast
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