Winchester Model 70 in 270

jcook01

September 11, 2008 07:06

All

I've an early 1970s Model 70 chambered in 270 caliber. Anyone know what the twist rate on the barrel is and what weight of bullet it's best suited for?

I searched around here on the forumm, I can find this info for my M1A and AR15 but don't see anyone really addressing twist rates and weights when it comes to the 270.

Regards, John

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  nononsense

  September 11, 2008 08:30

  jcook01,
  
  Your search was probably too specific. I've posted a complete list of Manufacturers twist rates on a couple of different occasions. Besides, if you can't find the information you can always use a cleaning rod and a tight patch to find out for yourself.
  
  The M70 in .270 Win. used a 1:10" twist. This twist rate will stabilize all bullet LENGTHS from 0.585" (80 gr.) to 1.285" (165 gr.) at .270 Win. velocities. There are a couple of LONGER specialty bullets that can require a slightly tighter or faster twist but they aren't generally known so the standard twist with all normally available bullets will work just fine.
  
  Best.

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  jcook01

  September 11, 2008 12:09

  Thanks, appreciate the feedback.
  
  With a 1:10, is there a theoretical sweet spot/weight? Time to do some more too specific searches. [:D]

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  nononsense

  September 11, 2008 12:24

  jcook01,
  
  The harmonics of the particular load usually dictates the sweet spot. If you're headed for a search, you can plug in 'Ladder test' or just plain 'ladder' which should get you two of the testing procedures used by a lot of us to establish sweet spots or accuracy nodes.
  
  Best.

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