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Slugging the bore might not be necessary. Chances are good that your grandfather got quality barrel stock for that gun and most likely of current manufacture for that period. With this in mind, I would place my money on the bore being .257 and nothing else. Load data to cycle the action is going to be a crap shoot until you get comfortable with your loading skills but whatever you do, error on the side of caution!!! You'll have to post some pics of this piece. I wouldn't mind shooting that one for sure
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