The 673 was also chambered in .243 Win. ! 600s had a rib and an 18.5" barrel , except for the Mowhawks , they had no rib. The 660s had no rib and a 20" barrel . A little over 500 Model 600s were made in .223 Rem. and are the most rare . There were only about 200 Model 660s made in .223 Rem. and again are the most rare ! There were approximately 3200 Model 600s made in .35 Rem. . My second centerfire rifle was a 660 in .350 Rem. Mag. and as someone above said , it was no fun to shoot and I didn't own it for long !
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