Do check accuracy if using a wad, though. Only my 14 bore rifle doesn't care if a wad is used or not.

My small bore rifles, .32, .40, .45 and .58 lost noticeable accuracy when a wad was added to the load.

With grease of oil lubed patches, a wad is not required - although peace of mind can be valuable- one less thing to be concerned about.

The powder does not 'seem' to become contaminated in the slightest - even though I have left my hunting rifle loaded for several months. Ignition and POI have been unchanged.