I had sent 2 arfcom members some 255gr swc .45 acp loads over 6gr unique to chronograph both averaged 850fps in their guns. One was in a beretta px4 the other in a hk compact.
I used my 4" lw champion and 5" loaded
4"
200 gr swc over 6.5gr unique
942 fps
394 ft lbs
200gr swc over 7gr unique
1011 fps
454 ft lbs
255gr swc over 6gr unique
912 fps
471 ft lbs
5"
200gr swc over 6.5gr unique
998 fps
442 ftlbs
200gr swc over 7gr unique
477 ft lbs
255gr swc over 6gr unique
942 fps
502 ft lbs