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cold bore?
Just guessing, I would say that the barrel is already broken in, and isn't causing your velocity swings. How far out are you seating your bullets? The closer to the lands you get, the more case volume you get. I suspect that IF you are feeding from the magazine, that it's a powder positioning issue. Your powder column is burning at different rates. Before each shot, point your barrel up and make sure all powder is sitting on the flashole. Lower slowly and shoot. Chrono a 5 shot group and see what happens...
Mike
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