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Looking for an all-around mpc, preferrably of the Perantucci or Bob Tucci variety. Have already tried deep cups (PT-88, 50 and 48), looking for something shallower to balance out the .795 bore size. This is an older 681, so large/Euro shank would be ideal. TIA.

DW ATU 3 works quite fine, with my 681. Also DW ATU 2 is good, its a bit deeper than the 3. MW 25 is a bit smaller than both DW and wire great with Cerveny 4/4 tubas too.

I would suggest an RT 62, a nice medium bowl, as it is not a deep mouthpiece, but it is just large-enough to
give you the depth of sound that a 681 can produce (and yes, I do have it in stock).

Thanks for the suggestions