If you are comfortable out to 400 yards, use your current setup. You will be fine.

If you want to shoot out to 500 or 600 yards, you have months to practice. Nothing wrong with a shot out that far if you know YOU can make the shot. Just because the rifle is capable, doesn't mean you are.

Shooting an elk at distance is cool but getting close and smoking one at 15 yards, is about the coolest thing in the hunting world.

Good luck and good hunting!!