Given all the research out there I really think the BB load is closer to the 38/44 Heavy Duty load then the FBI load. The 38/44 load was way hot and intended only for use in the larger frame, Smith N frame and Colt New Service, instead of regular 38s like the Colt Police Positive Special,
The FBI load was intended for k frame and similar service revolvers, not heavy large frame guns.
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