Yes, Mainly due to the fact that Winchester considered the .243 a Deer Rifle when using 100 grain bullets. Remington's .244 had a Twist rate of 1-in-12" which would only shoot bullet weights < 100 grains. Hence, the 6 mm Rem. which is a .244 Remington with a 1-in-9" twist.
Thanks Davers. Reason I'm asking is I have a chance at buying an early production Model 70. A friend who is quite well versed in many areas of firearms claimed the early Winchesters in .243s had a 1in12 barrels. My research hasn't uncovered that. Since the rifle isn't to be a safe queen and is out of state, just wanted to cover the bases.
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