Wise man says not to fix sumthin' that ain't broke or not out of sync! However, if you suspect the rifle should shoot slightly better, then two patches of JB Bore Paste - each patch going 10 swipes up & down the bore with a black nylon bore brush... then 10 with a smooth-sided patch jag.... then a full solvent/alky flush-out & oiling. No short strokes with brush or jag... straight down - then straight back up. It'll make your patches black as coal so don't get nervous. Just stop right there. Inspect the bore afterwards with a light. Go shoot it this spring & see if it improves. Let us know what happens.