Reliability with the mini-shells was poor, and this was primarily a test with the mini-shells. Standard 2¾-inch shells functioned fine, however, so it wasn’t an F. Still, the Shockwave is hard to shoot accurately. We’d pass.
We first tested this model in the October 2017 issue, the first year the Shockwave was offered. It earned an A grade, with the review saying, “The Shockwave was like all Model 590 shotguns — built to last and well made.