224 rifle twist and bullet size

[KLS]

Stumbled across this chart. One would imagine there’s a 22-250 chart kicking around somewhere. I’d like to be north of 3200 fps out of a 223 with varmint bullet 50-60 gr.

Looks like 1:8 is good choice.

 

[struff55]

1:8 is absolutely the wrong choice

 

[waldo54]

My 223 is a 9 twist, it will shoot anything up 69gr bullets really good, anything over that meh no so good, buddy has an 8 twist which shoots 75 gr really nice, my next one will have a 7 or 7 1/2 twist

 

[chrismc]

I have shot 60gr vmax in a 7.75 twist with superb results, 26 and a bit of h4895 gives 3180fps, 28" barrel

 

[yomomma]

I have a 1:12

Shoots 40 grain bullets just fine

 

[1ShotKing]

1:8 is absolutely the wrong choice

Care to elaborate? My 1:8 twist Tikka will shoot 40 grain ballistic tips into a ragged hole.

 

[jamesharrison]

Even a 1:14" twist barrel will stabilize a FB varmint bullet of the appropriate length from a .223. My longer [26.0"] barrels will do 3,500+ with a 50 gr. Berger Varmint Target bullet, while my shorter [20.125"] ones can squeak out velocities just a shade under 3,300 fps.

 

[Lefty Dick]

You are matching bullet length to twist rate, it has less to do with bullet weight since a 70 grain flat base bullet doesn’t need near as fast of twist as a 69 grain sleek boat tail.

 

[Sniffer]

Stumbled across this chart. One would imagine there’s a 22-250 chart kicking around somewhere. I’d like to be north of 3200 fps out of a 223 with varmint bullet 50-60 gr.

Looks like 1:8 is good choice.

https://bergerbullets.com/twist-rate-calculator/

 

[708fan]

"Over twist" has minimal detrimental effect on accuracy.
In a .308 bore for example a 185 Berger, 3000fps, in 1/9 has an Sg of 2.6 and will stay inside 0.3 moa at 1000 with a custom barrel.
A 178Amax, 2650fps with 1/13, Sg 1.27 and factory barrel will tumble 6/10 times at 1000 or one inch at 100yds with a 110.
Flat base bullets are stable at much lower Sg, Berger calculator calibrated for boat tails only.
Velocity is nearly irrelevant vs twist.
In the Amax example an Sg of 1.5 can be achieved with 1/12 at 2650 or 1/13 at 4300fps.