Jason Dufner climbed into second place at minus-10 thanks to a 4-under 66 in the third round. Second-round leader Steve LeBrun struggled to a 5-over 75 to tumble into third place at 9-under-par 201. Tim Simpson is one stroke further back at minus-8.
Gore, who became better-known thanks to his play at this year's U.S. Open, got off to a quick start with a birdie on the first. He came back to birdie the par-three third to move to minus-7.
The 31-year-old drained back-to-back birdies from the fifth at Troy Burne Golf Club. Gore, who owns four Nationwide Tour crowns, closed out his opening nine with a birdie on the ninth to climb to minus-10.
Gore, who won the Pete Dye Classic last week, got to 11 under with a birdie on the 10th. His par at the next was what kept his round going, though.
'It's death over there,' Gore said of where his tee shot landed on 11. 'Somehow I hit a great chip shot and made a 10-footer for par. You're 6 under through 10 and got it grooving and all of a sudden you hit this pitching wedge. You couldn't hit in a worse spot, but then you hit a great chip and make a 10-footer and you're running to the next tee. Sometimes making a good par is better than making a birdie.'
The Pepperdine graduate stumbled to a bogey on the par-4 14th, but got that stroke back thanks to a birdie on No. 17. He then closed with a par at the last to hang on to the third-round lead.
'I knew today would be difficult, but I wasn't thinking about that,' said Gore. 'I looked up at the scoreboard a couple times today and saw LeBrun had a three-shot lead, but that's not really that much on this golf course. You can never give up on yourself and what you're doing. You just have to be patient and keep hitting good shots.'
Dufner got off to a quick start with birdies on the second and fourth, but stumbled to a bogey on the eighth to slip to minus-7.
The 28-year-old got that stroke back with a birdie on the 10th. Dufner then sank three birdies over a four-hole stretch from the 13th to move to 11 under. However, he struggled to a three-putt bogey on 17 to fall one stroke behind Gore.
'More than anything, it's confidence in knowing you can hole a putt,' said Dufner. 'I just haven't had that feeling in a while. It's getting better. I really struck the ball well today, but it could have been a little bit better.'
Bill Haas posted a 3-under 67 to move to 7-under-par 203. He stands alongside Jon Mills, Jerry Smith and Chad Wilfong.
Andy Morse, Anthony Painter, Jason Schultz, first-round leader Brandt Snedeker, Peter Tomasulo and Steven Bowditch are one stroke further back at minus-6.