Barnstaple left it late again before beating visiting Ivybridge 25-23, making it two wins on the trot to open the season.
Seven days earlier, Barum got home 23-20 thanks to a late try against Exmouth.
It was a similar story against Ivybridge with Barum behind until three minutes from time when they grabbed the winner.
The first half was nothing special with two penalties for Matt Grieveson and one for Jordan Petherbridge in a 6-3 Ivybridge lead.
The second half was a different story.
A forward thrust brought a try for home flanker Nat Bayet and Petherbridge’s conversion made a 10-6 lead.
Back came Ivy with a wide try by No.8 Joe Wilson, followed by another from skipper Jay Gerrity after a typical hooker’s run.
Petherbridge got a penalty back to leave it 16-13 to Ivy, which was how it remained until a frantic last 10 minutes.
Winston James snaffled a try at the back of a line-out for Barum for an 18-16 lead.
Three minutes later, Tom Scoles cut a line through the home defence for a try. Grieveson converted to take the visitors 23-18 up.
Three minutes from time, lock Ashlee Crouch came up with a try to level it and Petherbridge kicked the conversion to win it.
During the half-time break Barnstaple official Verity White was presented with her RFU leadership award by Devon president Mo Jackson.
White has done almost every job going at Barnstaple over the years, including match-day managing. Currently she is the fixture secretary.
Barnstaple go to Brixham this Saturday for another Devon derby.