Hope M4 - Compatible with 180mm rotor?

Has anyone used a Hope M4 with a 160 to 183mm PM adaptor with a standard 180mm rotor? Looking at installing an M4, but hoping not to shell out another £35 for a 183mm rotor, but not sure whether the 3 mm difference will cause problems with braking power/uneven pad wear where the caliper is sat too high. Alternatively, anyone know of a 160 to 180mm PM adaptor that'll fit an M4 caliper?
Only those who will risk going too far can possibly find out how far one can go - T.S. Eliot
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