The only traditional game bullet in .30 cal that I can think of, that is intended for deer size game is the Sierra 165 gr HP in the Game King line. I have only read a bit on them, but they are alleged to be very accurate. Note that this is a component and not loaded ammo.
Note that the Berger people are selling a high dollar match type bullet that is billed as a "hunting" slug.
Once upon a time, the US ammo companies sold HP ammo in .30-30. I have not seen any in a long while.