Your .308 will be more than enough. Wingbone, A 250lb buck in certain parts of Ky is common for a mature buck. When the state only allows you to take one buck, with a 14 day rifle season, a little longer bow season, they have plenty of mature whitetails. The Good Lord has allowed me to take two deer in Ky. One field dressed 203lbs and the other 238lbs. You get real picky when you only get one, and you pay that $190.00 out of state tag fee. I live in Tenn. where the buck limit is 3, and we have no where near the avg body size Ky does. Both of my deer were aged by a Tenn. Wildlife Officer at 5 1/2 the other at what he guessed at 7 1/2 he told me when they get passed 5 it gets difficult to tell, that's a whole new forum. If you haven't never hunted there, you need to go. I hunt in the Western part of Ky.