1:9 twist max bullet weight 223?


Active Member
Jun 17, 2009
I plan to start reloading soon and am curious how heavy a bullet I can fire accurately with a 1:9 twist barel in a 223 rem, and do you have any preferance in bullet type or brand with a high bc?


Well-Known Member
Mar 12, 2009
They who ever they are says around 70 is all that will stabilize in a 1 in 9 twist.

My first savage 110 the old style pencil barreled 223 1 in 9 twist shot a 4 inch group at 600 yards shooting 80 grain nosler bthp. So just get a bunch and try them! Maybe you will be suprised.


Well-Known Member
Oct 15, 2007
Patagonia Mountains, Arizona
It's not just barrel twist which determines the stability of a particular bullet Air density and velocity play a part too. Higher altitude, higher temperature, and even higher humidity all give the air lower density and help a bullet to stabilize. The higher drag of a faster bullet trying to upset it is is a little more than compensated for by the bullet spinning faster at higher velocity from a particular twist barrel.

Bullet shape, length, and and mass distribution inside the bullet all matter. A given twist barrel can stabilize a much heavier tungsten core bullet than a copper alloy solid. For the same weight the copper alloy bullet will be much longer. For copper jacketed lead typically flat base bullets are shorter and more stable than VLD designs of the same weight.

As others have stated the only way to know for sure is to shoot some. Keep in mind that a bullet which shoots great in hot weather or high altitude could be unstable in cold weather or lower altitude using the same rifle and loads.

Higher humidity being less dense may seem counter intuitive, but H20 molecules are lighter than the other molecules which make up air which are N2 O2, CO2 and Ar.

Trending threads

Nightforce has great tracking capabilities, they are rugged, a bunch of elevation, holds zero forever, and reticles are designed for long range shooting. So if you are looking to shoot long distances constantly, then you need a scope that can take the abuse. -- gilmillan1

Culture Of Excellence At Nightforce Optics
By Len Backus

A high level of quality both in production and in service. Read More

Nightforce is such a solid combo of reticle, available elevation, glass that is good enough to shoot at the longest range you can dial. Nightforce has bullet proof construction that can handle the incidental horse rolling or some other rodeo action. -- bigngreen

Nightforce ATACR Scope Review
By Jeff Brozovich

The new NightForce ATACR is for sure a top choice for any long range shooter. Read More

The total package. Nightforce is the best I have used as far as turret feel and solid detents. I have never had one that didn't track right on and always return to zero. Nightforce NXS is the best value for everything I need. -- Broz

Nightforce Velocity 1000 Reticle Review
By Scott Shreve

I think Nightforce knocked it outta the park with this reticle! Read More