As Dan mentioned, Douglas has long been and still is a back-up supplier for many of the larger rifle makers. Their barrels are generally very good in quality, but are a step below some of the better barrels like Krieger, Lilja, Hart, and others simply because Douglas is a mass producer of barrels.
For quite a few years the "Premium" Douglas barrels were their air gauged barrels which even though mass produced were very uniform. They were pulled as "Premium" due to their better than average bore/groove uniformity. The overall quality of Douglas barrels is excellent for a hunting rifle, and many custom hunting rifles have been built over the years with Douglas air-gauged barrels. Most of them will shoot extremely well.
Someone asked about ER Shaw barrels, also. Shaw is also a barrel maker that supplies barrels to the trade as well as selling barrel blanks, etc. For a hunting application, their barrels are generally quite good.
However, as with most things, you get what you pay for, and the better custom barrels are hand lapped to insure bore/groove uniformity in each barrel. As a result, most will shoot better and clean up easier. That doesn't mean you won't get a good barrel from Douglas or ER Shaw however. On the other hand, you won't find too many - if currently any at all - of the REALLY GOOD folks shooting Douglas barrels at a BR Match.
- BCB