If you are wondering about how far you can shoot with a 30-30, then my guess is that you need another gun! I'm sure you are going to hear that the 30-30 has killed at 300+ yards! The reality of it is that it is a 150 yard gun. So if you THINK you might need more than that, go for a flatter shooting caliber! I'm sure you will also hear that the 30-30 has killed more deer than all other calibers too. That is probably true too, but it has also probably missed and crippled more than it's share too!
If you are going to shoot at 100-150 yards and you are good with it fine! Just don't stretch it!