The times I clean my firearms' bores:

-Shooting, even just one bullet.

-Returning from a hunt, even If I haven't shot.

The times I disassemble my firearm for a thorough cleaning:

-Opening day / sighting in day.

-Ending of the season.

Some quick firearm bore cleaning tips:

-ALWAYS clean from the breech to the muzzle. This pushes all debris, moisture, foul leading, etc. out of the barrel the way the bullet goes out.

-NEVER brush your firearm's bore first, always swap with a patch before brushing.

-DO NOT over saturate cleaning patches, a few drops will do.

-AVOID letting the rod of the cleaning figure bump/ride against the barrel.

-NEVER saturate a brush.

-NEVER disassemble your firearm past the manufactures recommendation. Leave that to a gunsmith.

And by the way, before you go out and buy a cleaning kit, I have read and learned from personal experience that Otis makes the best kits.