I just loaded a couple today with 55 GR SP, and was using them to ensure I had my chronograph set up properly (testing a new long range load)....24.1 grains of WC 735, in a winchester case, seated to 2.25 OAL, and using a CCI BR4 primer.
Just three rounds, but 3457, 3456 and 3423 FPS from my Savage 223, 26" barrel.