What size brush do use to clean a 7MM magnum?

To clean a 7mm Magnum, it's best to use a brush size specifically designed for .284 caliber, as the 7mm Magnum has a bore diameter of approximately .284 inches. A brass or nylon bore brush in size .284 or 7mm will effectively remove fouling and debris. Ensure the brush is attached to a cleaning rod that fits your cleaning setup to avoid damaging the barrel. Always follow up with a patch to remove any remaining solvent and debris.