I bought some of the HBWC component bullets, to reload myself, and I have indeed seen some leading, but not so bad I was concerned about it. If you are coming from a background of mostly auto pistol rounds and jacketed bullets, I could see how it might be alarming. I didn't notice much difference in leading between some older Winchester WC, some current production Remington (filthy stuff, powder wise, yuck), and my own W231/PD WC hand loads in new Starline brass, for whatever that is worth. I think its pretty standard for soft swaged wadcutters to leave lead behind in bores and cylinders... but I didn't grow up shooting revolvers during their heyday either.
Part of my problem, I think, is that I mistakenly ordered the .357" sized "match lube" version, instead of the standard .358" bullets, thinking I was saving myself some mess with the "dry" match lube. The .357" sized bullets are intended for tight bore PPC match guns, and not stock J-frame snubby bores. I didn't realize the difference in sizing until it was too late. Undersized bullets, particularly with soft swaged lead, are more likely to lead things up.
All this said, the accuracy I've had with the PD HBWC has been damn good, IMHO. And I really like the idea of a concave face to the bullet, if I ever had to press them into defensive service, and the PD bullets do have this shape. I'm not convinced they will make a better wound than a flat faced or button nosed WC, but it just seems logical that they would "bite and cut" better than a square shoulder or beveled shoulder, like that found on most DEWC bullets.
I have been debating what WC bullets to try next since the PD ones I bought are almost shot up, and will likely buy some Acme or Bayou coated ones, to try to reduce leading, and lead exposure while reloading.