Haven't shot the 30-30, but if Tim says it is accurate, you can believe it. I have found both the 45-70 and .357 to both be very accurate. Both of our 45-70's were accurate out of the box, and not really picky about ammo. My .357 was OK out of the box, but after a few shooting trips, it magically came together with 1 inch groups at 80 yards (thats the distance I sight mine in at) and because I was using a cheesy rest, I'm sure it is more accurate than that.
After all the talk I've read here about 30-30's, guess I'll be getting one in the future. Geez, this site is expensive!