The 243 shoots at a much higher velocity and is better at long range.
But the .30-30 shoots larger, heavier bullets and is suitable for larger game than the .243 and is considered by many to be the premier Eastern whitetail brush gun. More deer have fallen to a .30-30 than probably any other cartridge except the .30-06.
@Scorpion8- it is an extremely popular whitetail deer bush gun. You can also get the new Hornady ammunition. I think it's called lever revolution. Just has a higher velocity and ft pound energy.
Those LeverEvolution (not "revolution") rounds are not very good. The jacket sheds the core every time. I've used it in 30-30 and 44 mag. The two deer I shot last year was with the 44 mag LeverEvolution and I was not impressed.
Leverlution--Hornady tried, they were a great idea.....
I like that Hornady tried to think outside the box with the loads. I don't disagree it is obvious that they didn't perform well for you. The concept of offering more accuracy and higher velocity without high pressures was a good one. I glad that I don't have to rely on them.