I bought one for a Remington 700 action. I was building a custom .22-250 A.I. with a Pac-Nor barrel that also uses the Pac-Nor Rem-nut, but delivery time was about five months, so I bought a Bergara stainless varmint contour in .22-250 just to try one. Bergara had one in stock and it arrived in less than a week.
The Bergara product works just as advertised. While the Pac-Nor uses a nut that accepts the Savage barrel nut wrench and thick aftermarket recoil lugs, the Bergara uses a smooth nut and only accepts the standard OEM recoil lug. You need a Rigid Strap Wrench (1" wide) to tighten the nut. I have Remington recoil lug positioning tools, and the action wrench that retains the OEM lug, so that's not a problem. I installed it using a set of headspace gauges in about fifteen minutes.
The barrel shot right at .5" for 10 shot groups at 100 yards. I am confident that if I spend more time developing a load this barrel is capable of better accuracy. If this one barrel is any indication of Bergara quality, they are a good deal.
Above: Top barrel is Pac-Nor with their Savage type grooved nut. The recoil lug is a .250" thick double pinned Gre-Tan lug. With pinned lugs a locator tool isn't needed. Also use of the Gre-Tan lug for stocks with bedding blocks, means they fit without inletting (this is a Bell&Carlson M-3 SKU 1000 stock)
Bottom barrel is a Bergara varmint contour in .22-250 Remington with the Bergara smooth nut. This barrel will only accept the standard .185" thick OEM recoil lug.