Kevin Stadler, a two-time winner this season on the Nationwide Tour, posted a 69 and is tied for third place with Kyle Thompson (68), Scott Gump (68) and Brad Ott (63). The group is at 8-under-par 134 through 36 holes.
Bolli, who opened with an 8-under 63 on Thursday, started on the back nine Friday and had trouble getting going. He parred every hole on his opening side, then three-putted the first green for a bogey.
Bolli rebounded in a big way from the miscue at one. He reached the green with a 9-iron for his second at the par-5 second, and the ball stopped 3 feet from the hole. Bolli rolled home the eagle putt to match Schwamkrug at 9 under par.
The 28-year-old who won this year's Chattanooga Classic elected to hit a 3-iron off the tee at the 392-yard, par-4 seventh. Bolli knocked a wedge to 15 feet and sank the birdie putt to go one clear of the field.
'Anything under par in the afternoon out here today is good,' said Bolli, who recorded the fifth double eagle this season on tour in the first round. 'I definitely will have to keep making birdies this weekend. I'll have to play controlled aggressive, I guess you could call it.'
Schwamkrug, the longest hitter on the Nationwide Tour, opened on the back nine Friday and birdied two of his first three holes. He sank a 4-footer at the 11th, then drained a 40-foot birdie putt at No. 13. Schwamkrug three-putted from 30 feet for a bogey at the 15th, but reached the green with an 8-iron for his second shot at the 535-yard, par-5 16th and two-putted for another birdie.
Schwamkrug flew out of the gate on his second nine. He kicked in a short birdie putt at the first, two-putted for birdie at the par-5 second and capped off his birdie run with a 12-footer at three.
He hit a wedge to 5 feet to set up birdie at the sixth to polish off a 6-under 65 and get into good position halfway through the tournament. Schwamkrug has made only four cuts in 12 starts this season, but has improved on his weakness, his wedge play.
'I'm probably one of the worst wedge players out here,' admitted Schwamkrug. 'I'm still playing the same, but I'm hitting them closer. That part of my game has come around for me this week.'
Chris Tidland (67) and Tyler Williamson (70) are tied for seventh at 7-under-par 135.
The 36-hole cut fell at 1-under-par 141 with 64 players making it to the weekend.