shouldn't be a problem.
I downloaded a Reminton ballistics calculator and love to play with it. Granted, we're not talking your exact same bullets. But here are the results I got from the calculator.
100 grn corelokt fired at 100 yds would have 1642 ft lbs of energy
80 grn corelokt fired at 100 yds would have 1597 ft lbs of energy
I don't think Bambi would know the difference
If that doesn't help, a friend of mine has used the 85 grn sierra's that Art mentioned and killed several deer last year. These were Missouri deer but approx the same size you mentioned.