A partner in my law firm went on a "Long Range Shooting" training course over two days on a weekend. They shot out to 600 yards. He used a Remington ADL .30-06 and was shooting about 0.5" groups at 100 yards. He said everything stayed pretty tight (proportionally, which is the best you can hope for) out to 600 yards.
You can buy more expensive guns, but your probably won't get one that materially enhances your hunting success relative to a Remington 700 ADL in .30-06.
I have one of these Remington 700 ADLs myself. I prefer my Springfield .30-06 with a beautiful handmade walnut wood stock that my father made (he bought a military .30-06 and lifted the action and barrel). It is beautiful. It has sentimental value. BUT . . . I have no illusion that the Springfield is more likely to kill my elk for me than if I instead carried my Remington 700 ADL. My ADL also shoots well -- less than 1" groups at 100 yards.