With the 30-30 your usually pretty limited with factory stuff. I was shooting my old stevens bolt gun this weekend. Im a little less restricted on what I can feed it one at a time. I fired some factory remington core lokt 150gr over my chrony, just to know how fast it runs. 2264 was avg velocity from 3 shots. That bullet is not very aerodynamic so would run out of steam pretty quick. Now using the Lever revolution powder you can get a bit more out of it, 37gr got a 150gr up to 2506, that 230fps would make a difference. And I was loading Hornady Amax in it so would expect a bit more range out of it. I have a nice mildot scope on it and a range finder so hitting at longer range would be less of a challenge. It grouped very well with those amax. I was getting 2313fps out of some 168gr amax using lever revolution.
A 308 is considered a sniper rifle out to 1000yds. Yea in the book you might get 2600fps out of a 168gr bullet, but more realistic is 2500fps. So not outside the realm of reality to get a handloaded 150gr 30-30 to go 6 or 700.