10 gauge wire will handle a "constant" 30 amp load at 220 volts out to 75 ft with no discernable voltage drop. You don't need a bigger cable.
10-2 which has 2 leads and a ground would suffice in this case, however... 10-3 which has 2 leads a neutral and a ground would be preferrable in most cases. Required if running to a subpanel.