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so correct me if Im wrong here...if you getting best accuracy between 6.5-7.3 grns in 6" barrel.....in rifle barrel you will be using more powder for same velocity??? because it possibly slowing down...

ADI site has shite ton of load data in pistol section for the .38 special.....compare it to the .357 data if concerned.....looks like a heck of a lot of bangs per pound of powder....3-4-5grns a pop...

so longer barrel length will SLOW load down,after a point...X amount of inches the powder burning and pressure good,then acceleration stops and slowing begins...this is why some fellas have issues...

other than AP70N and trail boss...what powder do you have or can actually get???? once you work that out....data will be more relevant....as Gundoc says...use .38 special data...pretty sure guys...