The limit of your 30-06 is you not it. My 30-06 is 1.5" high at 100 and 7" low at 300 when sighted at 200. So a 300 yard shot is not at all out of the question.

PS It still has about 2500 ft lbs of Kinetic Energy at that range. Most people would tell you that 1000 was more than enough. So if you can shoot the 06 can kill it as far as you can shoot it.

Protect your hunting rights, "Spay or neuter a liberal."