270 Win twist

[crazysccrmd]

I'm looking at a Black Hole Weaponry 270 Win barrel with a 1:11 twist rate. Has anyone used a 1:11 barrel? I know it will work fine for standard 130gr bullets, but am curious about stabilizing heavier/longer bullets like 140 and 150 VLDs if I want to load for longer ranges.

 

[Art Eatman]

I'm no authority, but IMO 1:11 is a bit slow for the VLDs. Off the cuff, I imagine that 1:9 would work better.

 

[68wj]

Berger lists their 140 as stable with 1/11, and these are used in 6.8 SPC too, so you should be fine there with the higher velocity.

 

[Haxby]

Berger stability calculator shows 'marginal stability' with 140s and 150s and a 1/11 twist.
Seems counterproductive to look at a slower than average twist and longer than average bullets.

 

[Geno]

I have owned about 6 rifles, and 2 pistols chambered in .270 Win. All of them were 1-10 rifling. I can't respond to your question, but I personally would not purchase any .270 Win in a twist-rate other than 1-10 for hunting. Mine worked well with 90, 100, 130, 140 and 150 grain projectiles.

That makes me ask, why buy or offer a 1-11? That sounds like a barrel made for 90 and 100 grain projectiles for varmint.

JMHO,

Geno

 

[a-sheepdog]

The 1/11 twist is generally for the 6.8spc, which is the same diameter as a .270 win and they do make 6.8spc barrels.

 

[Geno]

a-sheepdog:

That is exactly what I was thinking, as is the 120 grain, .277 caliber projectile. I wouldn't use that for hunting medium or big game, and as such I didn't list it. Though, it might be fantastic for varmints.

Geno

 

[brutus51]

Interested to know the standard twist rate of most manufactures. Any take on what Jack O'Conner, the .270 guru, preferred? I' kind of interested in getting one myself.

 

[crazysccrmd]

Standard is generally a 1:10 twist. I think the BHW barrels are 1:11 because that is the twist rate they use for their .277 blanks, whether they get made into a 6.8 AR barrel or a 270 Win barrel. The BHW 3 groove poly rifling shoots very accurately with higher than average velocity and is super easy to clean. Usually I wouldn't consider the barrel because of the twist offered but I've had good experiences with the company.

As a side note, I calculated ballistics based on a 150 VLD at 2900fps and a 135 SMK at 3100fps. The SMK only dropped about 10" more at 1000yds and arrived going about 200fps slower.

 

[Jerry M]

1-10 twist is standard for .270 Win as stated above.

 

[quartermaster]

I don't have a manual handy, but the Berger reloading manual tells you what the twist rates should be for their bullets.

If you don't have access to one, PM me and I will get back to you. QM