I was thinking over the "thumbing" issue being the potential reason why it's shooting to the right, but I then realized I don't have that problem with my .22 bisley single six or my Smith 686. Those sights are pretty much straight on. Also, I dry-fired a few in my basement, paying careful attention to my grip and technique, and I'm definitely not over-squeezing with my thumb. So, sounds like I'll be giving Ruger a call.