Todd Demsey (68), Dan Olsen (69), Cliff Kresge (65) and Johnson Wagner (67) joined Gore at 9-under-par 135 at the Pete Dye Golf Club.
First-round leader Aaron Barber managed an even-par 72, but is tied for sixth place with Kyle Thompson (70), Kris Cox (71) and the Nationwide Tour's leading money winner Troy Matteson (69). The group is knotted at 8-under-par 136.
Gore, who played with fellow co-leaders Kresge and Wagner, mixed five birdies and a single bogey on his front nine. He added birdies at the 12th and 15th to grab his piece of the lead.
'We were all in a groove today,' said Gore. 'The whole group played great. You get in a good groove when you see a lot of birdies made. I had good feelings coming into this week.'
Kresge did not have the amazing start his playing partner Gore had on Friday. He only tallied three birdies on the opening nine, but closed with four on the back side, including three in a row from the 11th.
Wagner collected six birdies and a bogey in his round.
Demsey, playing this week on a sponsor's exemption, began on the back nine and he rattled off five birdies. He was much more inconsistent on the second side, with two birdies and three bogeys, including one at the last.
Olsen started on the back nine as well and recorded birdies at 15 and 17. He birdied the first and sixth, but like Demsey, Olsen dropped a shot at his last.
'You've got world-class players playing on this tour and they are all playing good this week,' said Olsen. 'It's going to get pretty good this weekend.'
Jeff Quinney and Bubba Dickerson, both former U.S. Amateur Champions, are playing solidly this week. Quinney shot a 3-under 69 and Dickerson carded a 4-under 68. They are tied for 10th place with Kevin Gessino-Kraft (69) at minus-7.
The 36-hole cut came at 1-under-par 143 with 71 players making it to the weekend.
Big Break II winner Kip Henley, playing on his final sponsor's exemption, followed his opening 76 with a 74 to finish at 6 over.