It isn't a TC? I could swear that I duck over some As with it... just that I got agA-ed out of it before and get grabbed out of it every so often. There are wonky frames/hitboxes everywhere, I hate it when I get BT hit by Natsu PO 8A, Xiba BT B+K, even connected once with Yoshi CE while opponent was behind.
I still wouldn't classify 66B as anything but "short range" though. It can get outdistanced by pretty much every "mid-range" thing - Aeon 66A, Natsu 66B, half the cast's 3B, shields 236B, aPat bA, the list goes on and on. "Mid-range" to me is starting position hit from tip range. And I'm pretty sure 4KB hits further, and FC 3K has a little extra "tip" distance too - 66B just feels like it bluntly stops there. Not discounting CH combo usefulness, of course.