Are you saying that the loads you used at 148 and 146 yds would not be good at 30?
I would never carry a load that would not be effective at close range - there are too many options
that allow everything from pointblank to 150 or more to even consider such a thing.
Chap has listed some.
I have taken several deer from 5 yds to 156 with 80 grns T7 and 460 gr BS conicals with great proformance.

Steve