Hunting guns a little oil the same day is ample. Target guns something like the Shooter's Choice grease is good mostly because of the hypo style applicator. I also lube the choke tubes on a competition gun where I would be embarrassed if a choke tube swap wasn't quick and easy. I suspect something like Slide Glyde from Brian Enos and many more such maybe TW-25 would be ideal on the shotgun action but don't know that or know of any shotgun specific tests.
