Yeah, Jerky, you don't know what you're talking about.

Looky here. Check the recipe description for September 2, 2011.

"The Co2 cartridges are the same size as the N20 cartridges so there will be no problem using C02 in your whipped cream dispenser — here are the steps!"

If you have any evidence to refute that the 8 gram cartridges I use to carbonate water are not the exact same size and shape as the 8 gram whip cream chargers please link.