Clean the Marlin and try that same 25gr 4227 load. See if it has the same result as your 3031 loads, or if it is cleaner. Be sure to try and duplicate the test as you did with the hiwall. If the hiwall was warm prior to firing, Make sure the Marlin is as well.
excess,,, thanks and i plan to do this very thing as this 4227 load is sweeeeet to say the least. i need to do something about the marlin as looking down the barrel i see that the lands are rough with not finished smooth metal so maybe ill have to clean her up sparkling clean and continue the "breakin with j words. i will try your suggestion tho with the marlin before i give her over to the "j's" for a workin over. that is a long and tedious job with the cleaning after each shot for so many shots but it smooths em up and if no brass gets "ironed" into the steel then the smooth finish is there to stay...been there a time or two on a couple bolt guns i have.
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