They got weird treatment!
The 600 and 660 models which they chambered in 6.5 and 350 RM, were the same action as the current model 7 and are SHORT! It was the main reason for the 6.5 and 350 RM, which were ahead of there time, to fail. They had a very short throat, and the bullets had to be seated WAY into the case so that capacity was seriously reduced. The 6.5 RM at the time was way short of velocity for what currently is being produced with the long action or single feeding. This is also why the 6.5 SS is better than a 4s or even a saum
...........Rich