What Barrel Length and Twist for a 270WSM Build

Full Curl said:
Thanks for all the good replies.

I checked out Berger's Twist Rate Calculator and looks like anywhere from a 8:1 to 10:1 would work for a 140gr to 150gr bullet. But when I go to the 170gr VLD it looks like I want a 8.5:1 minimum. Do the barrel guys even make a 8.5:1 or are you limited to 8:1 or 9:1?

If I went with a 8:1 over the 9:1 what would I be giving up with the 140s and 150s? Anything? Or in other words, why would I not want to go with a 8:1 since it'll also handle the 170s?
Click to expand...
I shot 140s with my .270 AI with 1:8" without any problems. I primarily shoot the 175 Matrix VLDs.
 
I'm putting one together now. Mine is a long action that I want to run 170 Berger's. I went brux 26" rem var contour in 1:8. I wouldn't limit yourself with a slower twist, you may regret it later and it doesn't hurt you with the shorter/lighter bullets. Might want to consider a longer mag box and massaging the action to be able to seat longer bullets🤔. Good luck with your build.
Rep
 
I did a Krieger 5.5 at 26" and 1:8 twist. Run the 170 Berger over Retumbo just a little under 3000 fps.
 
The 270wsm is a kick *** round! The most versatile round ever! 1:8 twist and you can do it all.
 
Eat Rice said:
No reason not too....im building a .270 sherman max and using a 1:8 tw...but i plan on using 170 bergers and a heavy type hammer/cutting edge bullet. I also live in louisiana with low altitude, high humidity and cold mornings that could destabilize the bullet if i dont esp with copper solids. I found a .270 8tw here for sale otherwise i would have got an 1:7.5 tw if i would have ordered a barrel.
Click to expand...
bergerbullets.com

Twist Rate Stability Calculator

Our newly updated Twist Rate Stability Calculator not only tells you what your SG is, but it also lets you know if you are reaching your optimized BC.
bergerbullets.com bergerbullets.com
 
I have a factory browning 270wsm and I'm shooting 110 gr Barnes TTSX out if it at blistering speed. It's a laser beam and puts deer in the dirt. I wouldnt shoot past 300yds with that light of a bullet though.
 
thebarreloutlet.com

Twist Calculator

The Barrel Outlet's Barrel Twist Calculator Calculator is a tool for determining the Gyroscopic Stability (GS) of your bullet and is based on the Don Miller twist rule. (Learn More). This calculator is used to find the optimal twist rate for your bullet. This is a general information...
thebarreloutlet.com thebarreloutlet.com
 
Mine is 25.5" 1:8 twist and it shoots 129 lrx in one hole and 170 Bergers at 3000 fps. It's flat nasty on deer and elk. It's the only rifle a guy needs for western and Alaska hunting. Go 1:8 & have no second thoughts. 156 Hammer Hunters are available too with 1:8 but not 8.5 or 9 twist.
 

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