ths78,
It sounds like you might be a woods hunter. So am I. Of the deer I have killed in the woods, my farthest shot is about 80 steps. All the rest have been under 35 yards with two shots being less than 15 yards. I never worry about missing out on a dream buck out of range because I am never able to see past 150 yds. At close ranges, I like a slower bigger bullet than a screamin fast little bullet, and the 30-30 fits the bill.
Also, at close range with a 30-30 you really don't have to worry about a bullet failing to do its job because 30-30 velocity is perfect for even the cheapest store bought bullets.
A .243 is also a terrific time proven caliber and if you are limited to one gun, it may fit you better if you hunt in more open land or if you terrorize varments.

C. Davis