I have some of the plated FN. They plunked very short in my SP01 Shadow Custom, 1.055, but because of their short bullet length, still seated at safe distance (.220 or thereabouts, IIRC, I'm traveling this week and don't have my notebook, but can send you info when I get back, if interested).
I shot my first batch of 124 gr FMJ last week, using 4.4 and 4.5 gr of HP-38, WSPP, mixed brass, 1.125 OAL. Results were acceptable -- all shots in IDPA headbox at 15 yards, and inside 0 at 20 yards. Groups were nothing special, but I'm going to play with OAL a bit and see if I can tighten them up.