Any ideas ?

[Cold Spring]

Yeah Craig I was referring to the Sterly. You might want to keep in mind that the vintage 12ga/3-inchers were loaded with long obsolete single-base straight NC powders. The closest we can get nowadays is SR4756 which as you know is also obsolete but still can be found here and there. I personally haven't loaded any higher velocity 1-3/8 ounce loads in 12ga/2-3/4" hulls but if so I'd likely look for published data with SR7625 or SR4756.