We recorded the 2m QSOs during March Contest, and these are the QSOs > 750km:

I4VOS/4, JN54PF, 792km SSB [220kb]
OK2KJT, JN99AJ, 844km SSB [370kb]
OM3KII, JN88UU, 836km SSB [226kb]
OK2RKB, JN89JI, 757km SSB [483kb]
OM8A, JN87WV, 884km CW [539kb]
S57O, JN86DT, 836km CW not recorded!
OL9W, JN89UJ, 820km CW [1mb] not easy…

Well below the 750km limit, but very rare:
GU3TUX, IN89VR, 619km SSB [169kb]

If you are interested in how your signal sounded in JO30EM, just drop the webmaster a line, and i will try to extract our QSO from the recording. Unfortunately, we started the recording not before 1635 UTC, so all QSOs before that time are not recorded.