I'm using a s&w victory, pulled out some really old manuals, lyman 38 shows loads that are alot hotter than any modern books, not about to test my revolver but may experiment with the lower end of some of these old loads, even speer #13 has some hotter loads
Not a very popular caliber but hopefully the few that reload it can share recipes
IIRC, I used 3.2 or 3.3 grains Unique with a 124 or 148 grain bullet. 4.8 seems high to me. What col are you loading to?