In my own personal experience a break open single shot is not generally as accurate as a bolt gun.

Talking to different people about break opens would lead me to believe that its a close race.

But in my experiences, which have been mostly with TC Encores, they just don't hold a candle to bolt. I like the TC, and I wish mine shot better, and I wish I could get TC to answer the phone or call me back or respond to my emails... but I guess they are so backed up with other disgruntled owners that they haven't the time to fix their warrenty problems.