I have 9 Ruger #1s starting from early non prefix rifles up to 2002 production. These rifles will all shoot 3 shot one inch groups at 100 yds with matched handloads. The calibers include 22 hornet, 218 bee, 223, 220 swift, 243, 25-06, 7mm STW, 30-06 and 458. I have heard about and read the articles on bad barrels, and assume that they are true, but in all my Ruger #1 trading, I have never had one shoot 3 shot factory ammo groups of more than 2 inches at 100 yds. I will be interested to see the additional information that you receive on this question. Those barrels probably exist, and it would be nice to know which ones they are.
Good luck!