barrel twist for 68 grain

JOEGUN94 · 01-27-2008, 02:25 PM

i have a 24" upper on a ar-15 lower,
and a winchester model 70 stealth,
i know each rifle will do very welln on there own, but is a 1-9 twist to fast or slow for 68 grain hpbt.
i am new to reloading and i read all i can and also know each powder primer, brass combo will work differently in each rifle.
i am simply trying to cut down on the numerous weights and types of bullets. but your advice is most happily accepted

lefty o · 01-27-2008, 02:37 PM

a 68 gr bullet may or may not stabilize for you with a 1-9twist. its borderline. without double checking, the winchester may have a 1-12 twist which would probably shoot poorly with that weight bullet.

Palladin8 · 01-27-2008, 04:12 PM

The 1:9 twist rate will stabilize the 68gr bullet. I have a Bushmaster upper with a 1:9 twist as well as one with a 1:7 twist rate. They both shoot the 69gr sierra match king about the same. Now getting up over the 69gr is another story for the 1:9. I tried the 77gr and they were not as accurate. Still not unacceptable but just not as accurate.

rfc357 · 01-27-2008, 05:45 PM

Check the bullet manufacturer for specific recommendations on twist. Hornady says both their 68 and 75 BTHP will work in 1-9.

Zen900 · 01-27-2008, 06:23 PM

My Stevens .223(1 to 9 twist) recommends 68gr sierra

01-27-2008, 02:25 PM	#1
JOEGUN94 Senior Member Join Date: Oct 2006 Location: MARSHALL Posts: 160	barrel twist for 68 grain i have a 24" upper on a ar-15 lower, and a winchester model 70 stealth, i know each rifle will do very welln on there own, but is a 1-9 twist to fast or slow for 68 grain hpbt. i am new to reloading and i read all i can and also know each powder primer, brass combo will work differently in each rifle. i am simply trying to cut down on the numerous weights and types of bullets. but your advice is most happily accepted

01-27-2008, 02:37 PM	#2
lefty o Senior Member Join Date: Mar 2002 Location: mn Posts: 4,812	a 68 gr bullet may or may not stabilize for you with a 1-9twist. its borderline. without double checking, the winchester may have a 1-12 twist which would probably shoot poorly with that weight bullet.

01-27-2008, 04:12 PM	#3
Palladin8 Senior Member Join Date: Nov 2007 Location: Las Vegas, NV Posts: 405	The 1:9 twist rate will stabilize the 68gr bullet. I have a Bushmaster upper with a 1:9 twist as well as one with a 1:7 twist rate. They both shoot the 69gr sierra match king about the same. Now getting up over the 69gr is another story for the 1:9. I tried the 77gr and they were not as accurate. Still not unacceptable but just not as accurate.

01-27-2008, 05:45 PM	#4
rfc357 Senior Member Join Date: Jun 2006 Posts: 741	Check the bullet manufacturer for specific recommendations on twist. Hornady says both their 68 and 75 BTHP will work in 1-9.

01-27-2008, 06:23 PM	#5
Zen900 Senior Member Join Date: Dec 2005 Posts: 704	My Stevens .223(1 to 9 twist) recommends 68gr sierra