MOSCOW, 3 Sept 2015, (AFP) - Australian Gaunt hit three birdies, an eagle and a double bogey on the back nine alone, with Scotland's Jamieson picking up six birdies in a round of no dropped shots.
"It was good to bounce back on the 16th and 18th there after a double bogey at 15," Gaunt told europeantour.com.
"Apart from that I played great golf today. I have been playing well. Last week, I wasn't stressed about missing the cut.
"I got told I was playing great golf and I just came out here believing that now and if I can keep that up, one shot at a time, the results will take care of themselves."
Wales' Bradley Dredge and England's Lee Slattery were a shot back on 66 at Skolkovo Golf Club.
An eight-player group on four under included defending champion David Horsey, chasing a second victory in three weeks following his win in Denmark, in the first tournament to count for next year's Ryder Cup.
Selected first round scores in the EPGA Russian Open at Skolkovo Golf Club Moscow (GBR & IRL unless stated, par 71) (x) denotes amateur):
65 - Daniel Gaunt (AUS), Scott Jamieson
66 - Bradley Dredge, Lee Slattery
67 - Ben Evans, Craig Lee, Panuphol Pittayarat (THA), David Horsey, Sam Hutsby, Thitiphun Chuayprakong (THA), Tom Murray, Keith Horne (RSA)
68 - Rahil Gangjee (IND), Maximilian Kieffer (GER), Anthony Summers (AUS), Simon Griffiths, Moritz Lampert (GER), Prom Meesawat (THA), Cyril Bouniol (FRA), Pablo Martin Benavides (ESP), Edouard Espana (FRA), Kalle Samooja (FIN), Matthew Nixon, Estanislao Goya (ARG), Jake Roos (RSA), Matthew Southgate, David Drysdale, Jyoti Randhawa (IND)
69 - Jordan L Smith, Merrick Bremner (RSA), Javier Colomo (ESP), Soren Hansen (DEN), Simon Wakefield, Pariya Junhasavasdikul (THA), Peter Holland, Oskar Henningsson (SWE), Mark Tullo (CHI), Thaworn Wiratchant (THA), Henri Satama (FIN), Daniel Vancsik (ARG), Ricardo Gonzalez (ARG), (x) Ben Stow, Danie Van Tonder (RSA), Ryan Lynch (AUS), Jerome Lando Casanova (FRA), Mark Suursalu (EST), Chris Lloyd
70 - Niclas Johansson (SWE), Damien McGrane, Lasse Jensen (DEN), Shaun Norris (RSA), Sebastian Garcia Rodriguez (ESP), Mardan Mamat (SIN), Jason Scrivener (AUS), James Heath, Andrea Pavan (ITA), Niall Kearney
71 Jacques Blaauw (RSA), Peter Lawrie, Johan Edfors (SWE), Petr Dedek (x) (CZE), Alessandro Tadini (ITA), Kevin Phelan, Dodge Kemmer (USA), Dylan Frittelli (RSA), Greg Snow (KEN), Ross McGowan, Oliver Farr, Michael Hoey, Chris Doak