223 Barrel Twist


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viking499
May 14, 2007, 07:50 AM
What will be the difference between a 22" barrel with a 1/9 and a 1/12 twist in a 223 caliber?

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trueblue1776
May 14, 2007, 08:12 AM
faster twist for heavier rounds, a really fast twist will shred lighter varmint rounds while a slow one won't stabilize a long bullet. 1 in 7 is fast 1 in 12 is slow, most guys I know like a 1 in 9 for recreational shooting and hunting. 1 in 9 will handle 53 to 69 gr no problem.

if you want to shoot 45gr varmit loads I'd get a 1 in 12 or 1 in 14.

stormspotter
May 14, 2007, 08:38 AM
Trueblue1776 is right about twist rates, but barrel length can also make a difference.

There are exceptions to every rule. I have 2 longer barreled 223's, with a 1 in 9 twist, that will shoot the Sierra 77 gr. OTM well. My 16 in. AR, with a 1 in 9 twist, will not. Barrel length increases velocity and that will help stabilize a heavier bullet in some barrels.

My 223's will also shoot the 52 Sierra BTHP's well, I just don't load them to the MAX.

Onmilo
May 14, 2007, 09:11 AM
This is just me because I don't shoot 1000 meter matches with a .223 but if I am going to shoot 75 grain or heavier bullets I choose a .243 Winchester.

I do shoot 300 meter Matches with an AR and I use a 1-9" twist rifle and 64 grain bullets for this.
I also use a 1-10 twist barrel for hunting bullets of 50 to 53 grains.
Super accurate out to 400 meters for hunting.

A 1-9 twist will stabalize about everything 50-68 grains and is the best all around twist offered on AR barrels.

A 1-12 is the old M16A1 twist and it is really best with 45-55 grain bullets
It does extremely well with 53 grain match bullets to 300 meters.HTH

rangerruck
May 14, 2007, 11:11 AM
1/12 bbls can only do up to about 62 grains, max. depending on how good is the bbl maker. my cz will just barely get 62 grainers to do moa at 100 yds.

sectional_density
May 14, 2007, 12:23 PM
I'm using Sierra 63 grain softpoints in my 1:12" twist CZ 527 .223 Rem. Sierra manual says that this bullet "may" work in 1:12.....seems to work well for my rifle, as I've been getting MOA or better at 100 yards (for the most part) from a nice shooting rest. Doesn't change much w/ the 50-55 grainers, either.

Vern Humphrey
May 14, 2007, 01:38 PM
Barrel twist is measured -- as everyone knows -- in inches per revolution. But stabilization is really determined by revolutions per second.

A 1 in 12 barrel with a 3,000 fps muzzle velocity will impart a spin of 3,000 revolutions per second. Boost the muzzle velocity to 3,300 fps and it will impart a spin of 3,300 rps -- which may make a significant difference in stability. Longer barrels and heavier charges will often stabilize bullets that shoot poorly in shorter barrels at lower velocities.

viking499
May 14, 2007, 10:26 PM
Sounds like the 1/9 would suit better.

270Win
May 15, 2007, 12:04 AM
I'm using Sierra 63 grain softpoints in my 1:12" twist CZ 527 .223 Rem. Sierra manual says that this bullet "may" work in 1:12.....seems to work well for my rifle, as I've been getting MOA or better at 100 yards (for the most part) from a nice shooting rest. Doesn't change much w/ the 50-55 grainers, either.

I've also had MOA or better results with the Sierra 63 grainers. I have a 1:12" Rem 700 VLS with the 26" bull barrel.

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