If you want 3000 at low pressures with a 140 out of a 6.5, you only got one option... have a look at a 6.5 SAUM.... (6.5 GAP 4S) with ADI2217 (H1000)....
Everything else runs smaller capacity and higher pressures, which appears to be more destructive than capacity alone... the penalty of course is around 60 grains of powder in that larger case...
Its funny but we may yet see a move back to larger capacity and slower powders to duplicate what we can achieve with smaller capacity and higher pressures for less fuss and bother and a longer lasting barrel... not to mention a larger safety margin...
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