Don't have a shockwave, but have an 18" 500 and a 6" super shorty. I've tried the good stuff with flite control wads and the cheap Walmart stuff, all 00 buck. The 18" gets cheap stuff cause it patterns better at my realistic distances. The super shorty gets flite control cause it actuall spreads while the cheap stuff doesn't at those distances from that gun. My advice is try it where you'll most likely use it (hopefully never) and use what works for you.