Douglas XX were mostly selected because they had little or no run out. Your comments kind of support what I am saying as a Douglas was probably in quality about like the old Green River, Montana or today's Green Mountain. I doubt if it would be up to the quality of a Rice barrel. I think the XX only cost about $20 more
Those of us that shot them remember that almost all barrels back then either needed to be lapped or generally "shot in" with a few shot to get their edge. Once a load is worked up and they have been shot a bit almost any barrel now offered will out shoot the shooter. The extra $100 for a match quality barrel is a bench rest issue.
DP