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Homemade bore guide

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I'm sure this isn't a well kept secret or my invention, but I figured I'd share my success. I took a spent .22 magnum case from my gun and found a drill to fit the inside dia. I drilled out the base of the case and smoothed it up with a fine round file. Now when I clean my bolt gun from the receiver end I just pop the case in the chamber and it works like a charm.