Accuracy lives in the barrel, and the barrel needs the right chemistry: carbon solvents for the range-day residue, copper removers for the fouling that builds in high-volume rifles, and bore snakes for the fast field clean between deep sessions.
Match the brush and snake to caliber exactly, and let solvents dwell - most fouling surrenders to time, not scrubbing. Precision shooters, ask about copper indicators that show when the bore is actually clean.