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Winchester Model 70 in 270
jcook01
Member Posts: 154 ✭✭✭
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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
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
Comments
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.
With a 1:10, is there a theoretical sweet spot/weight? Time to do some more too specific searches. [:D]
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.