I'm curious if the internal tuner on that rig is capable of matching it well.
This is a ZS6BKW style antenna. When it says it operates on a band without a tuner, it doesn't necessarily mean the entire band. The frequencies where it works without a tuner may not always be the frequencies you want to be on. For instance, EZNEC sez the antenna has the lowest SWR around 29 MHz which is indeed in the 10m band but on 28.4 MHz, where most of the action is, the SWR is 7:1 according to EZNEC.
The autotuner in the IC-746 is spec'ed to operate with SWRs up to 3:1 so don't expect it to achieve a match on 28.4 MHz. It might or might not. Also, the SWR will change with height above ground and in the inverted-V configuration, to name just a couple of things that can change the SWR. I modeled it horizontal at 40' high.
It is hard to predict whether you would be satisfied with that combination or not. A ZS6BKW cannot be recommended for 80m, 30m, 15m, and 6m operation so beware the "works with tuner" marketing hype. It certainly is unlikely to work with the IC-746 internal autotuner on those bands. Even with a wide-range external tuner, the SWR on the coax between the tuner and antenna will be worrisome on those 4 bands.
