We are talking hunting regs and CO's, so they tend to be much more practical than federal law and agents of the state. Make sure you only have 5 round clips on you when hunting and the CO will never bother asking about hypothetical 8 rounders that you have at home.
This is no different than hunting with a semi-auto rifle that takes box mags. If you only have 5 round mags with you they don't care if it can also accept 30 round mags. Or when bird hunting and the only thing limiting your tube mag to 2 rounds is an easily removable plug. As long as the plug is in place when the CO checks then you're fine, even if you could just remove it 5 minutes after he leaves.
Mark