I know...
that they can be fired pretty well, with adjustable sights out to 50yds. I think the PPC two-inch match called for six rounds at that range, but I could be wrong. (It's been a LOT of years since my PPC days). Even at 25 yds, some guys could shoot way more x's on a B-27 than most people would believe. The guns were basically stock (no bull barrels, ribs, etc.), but the actions could be smoothed and I think smooth triggers were ok. Like I said, it's been many years, and I could be FOS on some of this, but not on the accuracy part.
With the non-adj sights (basically a groove on the topstrap for rears, rounded blade in front), they are tougher to shoot that well, but the sights don't/can't break. Once you establish a good POA, your in out to 25 yds, for sure, if your after center mass.