I know this thread is a little old but are these plated? I haven't used the Bulletworks bullets but my Loaded would not reliably feed Xtreme SWC at any OAL (one FTF out of 20 shots or so, regardless of Tripp, Wilson or Springfield magazines). I recently switched to a different bullet which has a much more rounded edge on the flat part, and this seems muuuuch better.
With the Xtreme you could actually feel a "ka-chunk" as the slide returned to battery, from the bullet nose hitting the chamber initially. Now it's just a "chunk" as it is with RN bullets.