One does not need a custom rifle, nor a heavy barrel, custom trigger, or high power expensive scope to kill deer at long (700 yards) range...
My Rem 700(glass bedded and trigger adjusted) with a Leupold 3.5X10 has killed a deer at 625 yards with me behind the trigger. It will shoot 4-6" groups at that distance, been there and done that.
All you need is a normally accurate rifle, a good range finder, and know yer trajectories at distance. Oh, and a deer that will stand still......
Heck, I killed that deer with a 130gr NBT, so it can't be that hard....
The question is repeatability. Can you do it everytime. Thats why in certain situations I choose a custom rifle. Its all about choice to me. I quess thats why i own over 100 guns! I have shot deer at 503 yards with a 2.5x10x56 S&B , but i dint want to have to do it everytime! With a custom rifle it allows me to shoot as far as i can range with my Vectronix Vector 4. 