I've always viewed the 4.2gr/tb/38spl vs 357 data as a typo. I shoot/load a lot of cowboy action loads (plinking) and the hodgdon data doesn't make since.

38spl 158gr lswc 4.2gr of tb 804fps (7.7" bbl) 13,700cup
357mag 158gr lswc 4.2gr of tb 865fps (10" bbl) 20,400cup

more case volume with the 357 case but 33% more pressure for the same load???? 20,400cup vs 13,700cup

I shoot a lot of low velocity loads in mag calibers and tend to use powders like these. They have excellent case fill for their small loads.


Sometimes it's good to go to the range and run several hundred plinking rounds thru the magnums simply enjoying the day shooting reactive targets.