That is interesting, is that a skeet specific rule or in general?Maddmatt,
Not sure i understand the question......
But if i have it right your asking if as a member of NSSA you could enter the CPSA skeet majors (for example) - then my answer would be NO you couldn't.
You could however enter the NSSA majors held here in the UK - Ironman, UK Open, BSSA Open, European Open. Plus any NSSA registered shoots as you NEED to be a member to enter these.