.270win twist rate.

[jraney]

Optimal twist for a .270 to shoot 110gr bullets only.

heres what I want. 26” heavy barrel .270. Built to shoot 110gr bullets as fast as I can. Deer sized animals and smaller. Coyotes. Pigs. All that sort of stuff.

[Dave Hoback]

If you are sticking with 110gr, the 1:10 works perfectly. Honestly, 1:10 will stabilize 270 bullet weight lengths just shy of 150gr. Granted, this is for bullets that follow the normal rate of Weight to Length. Remember, it's the LENGTH which causes destabilization and needs a faster twist. It's confused with weight because "generally" they coincide hand in hand. But there are exceptions to the rule.

[jraney]

Thank ya Dave , so a 26” barrel with a 1:10 twist should do fine?

[Fuj']

At a comfortable 3200 fps a 12 twister would be the sweet spot.
I ran 110's in my 28" Ruger 77 270 with an 11 twist Douglas. Very
accurate with old school IMR-4064. You'll be fine with a 10 twist,
and keep your options open for the longer tipped bullets.

[Dave Hoback]

Fuj, is correct. IF you plan to stay ONLY with lighter 110gr, the 1:12 is Optimal. The BEST twist for a given weight(length), is actually the SLOWEST twist rate which completely stabilizes THAT specific weight pill. Most shooters use a range of weights. So having a twist which supports several is the best course of action. Yes, the 1:10 will work well...AND give you a decent range of bullet weights to choose with confidence. Now, the 1:12 IS the absolute best for 110gr bullets. However, it will not give very good results for anything heavier.

[jraney]

Ok. Sounds good. Thank y’all.

[Fuj']

it will not give very good results for anything heavier.

It's the length of the bullet, not the weight. You can have a 110gr bullet one inch long and
calculates out to the 12 twist rate. Take that same 110 grain weight and turn it's shape into
a longer VLD, you may find the 10 twist is a better fit, given the same speeds. Another factor
to consider is bullet RPM. Some times people wonder why their bullets blow up. It's mostly
from high speed and too fast of a twist rate. JBM's stability is a good tool to reference.

[Dave Hoback]

Yes, thank you Fuj., I stated that in my first post. It’s just commonly associated with weight because naturally heavier bullets are longer. But there are exceptions. Some bullets are drastically longer even in the same weight category.

Post #2:
“Remember, it's the LENGTH which causes destabilization and needs a faster twist. It's confused with weight because "generally" they coincide hand in hand. But there are exceptions to the rule.”

[Dave Hoback]

Perfect example of an “exception to the rule”.

In US 5.56 rounds, the 62gr m855 vs the m856 bullet length. While a standard 1:9 twist works fine for the m855, the m856 REQUIRES the faster 1:7.
https://i.ibb.co/HnHJxC8/D5-C9-CF80-BD27-494-B-BD1-C-59-A0-B9887-A75.png (https://imgbb.com/)