As others have mentioned, I usually know a "shooter" when I see it. It's difficult for me to quantify a "shooter" buck, but many variables come into play depending on the tag I have, the company I am with, other hunts planned for the season, and the character of that buck, to name a few.
You asked specifically about score though, so for me I set my sights on a goal of 180" or better. Having said that, I would dump a double drop tine 160 incher over a classic 180 inch buck given the chance. Why? I have yet to harvest a drop time buck, and think they are cool!
I'm a sucker for when a plan comes together, and have found that the experience of having a plan, the stalk, the scouting, the shot, and an eventual harvest on that targeted animal brings more joy and satisfaction to me than inches these days. Maybe I am getting old?
I always encourage someone to never turn down their biggest buck! If your target is your biggest buck to date each year, you will soon have some smokers on the wall.
Happy hunting all!