I spoke too soon, it seems. I took it and a couple of other guns out this afternoon, but the Weatherby was back to giving me trouble. Bullets hitting vastly different spots at 50 yards, and the 200 grain Partitions were key-holing. I'm running out of bullets for it, too, so I decided to quit. At least it's hitting closer to the point of aim than before.

Apparently, this one was made in Germany and had a 1 in 12" twist rather than the 1 in 10" twist in use today. I wonder if that could be throwing them off so badly.