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To read a good discussion of the characteristics and peculiarities of micro Groove barrels and their ability to shoot cast bullets, go to your local library and see if they have back issues of the American Rifleman. C. E. Harris (who posts occasionally on this Board) wrote what is probably the definitive article on Micro groove barrels and cast bullets for the July 1982 issue. The article is "Marlins Micro-Groove Barrels Will Perform". One of the characteristics of Micro Groove barrels is that they have bores somewhat larger than those with more conventional rifling do. Groove diameters are about the same. Bullets that fill the throat will give good accuracy with little tendency toward barrel leading. Tight spots can be a problem in Marlin bores. Running a tight patch through your bore will help identify them. My Guide gun had three. One where the word Marlin was stamped, one at the rear sight dovetail and one where the front sight ramp was mounted.
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