Ross,
Thanks for the additional info. This 270 is well after the time frame you mentioned for the change from Douglas to Wilson, 2+years after it's approximate start (I have no idea when they changed again to their own barrels). This barrel is roll marked STURM, RUGER & CO. INC., SOUTHPORT, CONN. U.S.A. The "RP" left top on the barrels chamber (looks stamped, not roll marked) I just assumed was a proof mark that did not indicate barrel marker (a backwards R sharing the verticle line as a forward P in an almost complete "C") and with .270 WIN. below it. I assumed that any barrel brand could have been proofed or set out to be proofed by Ruger, so maybe it was not an indication of who made the barrel. Obviously not a good idea to assume anything as you've proved on the 77's, and I do know better. I just took the easy path as it really didn't matter that much to me.
Off topic to expand on assumptions...
I've been down this Douglas custom barrel thing before with another mid 70's firearm that I pretty much know all there is to be known about them, and do have proof to back it up from as close to the horses mouth as you can get considering he is long dead. The earliest ones were always said to have Douglas barrels by the hoards, roll stamped in a way to separate the barrels themselves from later production that also had other design changes that overlapped the first of them until in stock parts were used up. They demanded higher prices because they really were all exceptional tack drivers as much as the Douglas barrel thing. Some said Shilen barrels for the same reason, with various proof marks being suggested that i never saw for whatever they wanted to believe there's was. I have one of the eariest and didn't buy into any of it as it was all heresay with no proof known or available from the company that marketed them. So I took on the challenge and eventually it was proven beyond a reasonable doubt. The biggest break with the help of a gent found that was "there at ground zero" from before day one as a friend, neighbor and in a way smithing student who hung out in the shop of the firearms designer who built the prototype in his home shop. The same gent who also did the inplant training of building the production barrels overseas for the company that put their name on them and sold them. So it was proven beyond reasonable doubt that the prototype actually had a Douglas barrel, and that up to 2-3 others were also built custom in his home shop with high end wood for family/friends that may have also had Douglas barrels. But NOT any of those made for commercial sale had them that the hoards all owned. Was fun to finally run it down after so long trying while building a data base on serial numbers and variations not assembled as a record before. The serial only as an approximate year thing - I only accepted those with a sales reciept in hand to verify when they were sold, but still only as approximate because it being unknown how long they had sat in stock before the sale. A pattern finally started to come together as I got more accepted for inclusion though, so a generalization of approximately when made for some but not all serial ranges. Some clowns even insisted they knew for positive that they theirs was bought on such and such date but didn't have a receipt that were up to well over a decade before the prototype was made, and got pretty rude when corrected. Even after all that folks still believe what they want to believe far more than the facts as now knowN as far as they go. To this day those from the very short era thought to have custom DOUGLAS barrels still do bring much higher prices. The later models were also excellent shooters, not quite as good as the first, so maybe the earliest do warrant a little more value, but not due to the false claims that still haunt them. Some ACE's are not retrainable, have closed minds IOW. At the same time I also cleared up the facts on another model from this company that almost nothing was known about, the best of its kind and only available for a very short time. I had one, so I traced this latest version back through its short run in European matches and the designs decades of dominance in them made by a German maker to over 160 years back to its very begining as a very high end custom design from its designer's shop in Switzerland (that is stil in business). By far the most valuable for resale I ever owed from this mostly entry level company. sold for a very high price for this company when new, very few were ever made and they were still up to the European matches that gave them their value to the right person. In my case I found an gent in OZ that had competed with them before and that lead to a gent that wanted it.
I have a custom Sako L461 that has a Douglas barrel. I know the gent personally who had it built by Sako in their custom shop long ago for the truing, custom higher end stock and barrel, so don't question the barrel. Doesn't matter to me either way though, its other attributes make it special enough to me.