The trio of Gareth Wright, David Patrick and David Orr posted a seven-under-par tally of 137 to finish alongside England at the head of the standings.
The Scots, six-time winners of the title down the years but without a victory since 2006, were boosted by a late charge from Wright, the British Club Professionals' champion.
The Welshman, who opted to switch allegiance and represent the Scottish PGA, had been level-par through 12 holes but made an eagle on the 13th and birdies at the 15th and 17th in a four-under 68.
Patrick added a 69 to the card while Orr, the former Scottish PGA champion, had a non-counting score of 71.
England, led by Steve Parry's 67, finished alongside the Scots as the two Auld Enemies opened up a six-shot lead over third-placed Ireland. France, the defending champions, are eight strokes back on 145.