Who has a barrel faster than 8?

[Alleycat]

300 WTF or 308. 1 in 7.. 1 in 6.5..

[rsilvers]

I have a 1:4 coming.

[LouBoyd]

Pac-Nor offers barrel blanks and finished barrels for most bolt rifles in faster twists, including chambers in 300 Whisper and 300 Blackout. I don't believe Pac-Nor directly makes "drop in" barrels for ARs. (wish they did).

http://www.pac-nor.com/barrels/

300 bore (for 308 bullets) in 4", 6", 6.5" 7", 7.5" plus 8" and many longer.

[Alleycat]

I'm trying to find out how many people have faster than 8 guns. How common are they? If this sounds cryptic, there's a reason.

[LouBoyd]

Originally Posted by Alleycat

I'm trying to find out how many people have faster than 8 guns. How common are they? If this sounds cryptic, there's a reason.

I have three rifles with faster than 8" twist barrel though none faster than 8" twist in 30 caliber.

A 7mm BR with a 7" twist, 16+" Pac-Nor barrel. It's designed to shoot Berger 180 VLD's either low supersonic or subsonic. It's on a Rem 700 SA. It's mostly for experimenting with subsonic and transonic ballistics.

A 5.56x45 Colt AR-15 with a 20" x 7" twist barrel. It's was designed use in arctic conditions. I use it for shooting VLD bullets.

A 1937 Carl Gustav 6.5x55 Swedish battle rifle It's approximately 1:7.5" twist.

Since I shoot at over a mile elevation and in the relatively warm weather of Arizona I don't need fast twists to achieve bullet stability for most practical shooting.

What's your reason?

[LouBoyd]

Originally Posted by rsilvers

I have a 1:4 coming.

What bullets and what conditions can use a 4" twist 308 cal barrel?

That might be a fast enough twist to stabilize LRB J40 220 grain solids fired at about 1300 fps as they drop though the speed of sound from a 300 BLK. It would be an interesting test.

I wonder if there are any bullet designs which would be stable if fired into water with that twist rate. My guess is not.

[Alleycat]

Just looking for .30 cal guns. Come on Spook you got to have one.

[dick]

Mr. Silvers, what are you saying? Are you implying that 1 in 4 is the new 1 in 8
I guess that's one way to sell more barrels. LOL HA HA

[jimpa]

I have a 6.5, knew the minimum would be 8",,, talked to a tech at pacnor and he built a 300/221 with a 6.5 and was pleased.
He was right and I am happy with it.
Have only shot 220 and 240 Smk so far. Going to try some 125 noslers

[Spook]

Originally Posted by Alleycat

Just looking for .30 cal guns. Come on Spook you got to have one.

Were over 7500 ft in elevation where I shoot.... 10's easily stabilize 240's here. You have a real long bullet you're trying?