Will 1/9 stabilize 36 or 43gr?

[rtlltj]

Before I go and waste a bunch of money on some ammo I just wanted to check to make sure that my .223 RRA upper with a 1/9 twist barrel will be able to stabilize those lightweight varmint rounds like the 36gr barnes VG and 43gr federal tnt green. I'm trying to find some good ammo for coyotes but it seems like everything lead free is all too light. Seems like all the varmint ammo is made for bolt guns with 1/12 or 1/14.

[22popnsplat]

in 223 with a 1:9 twist light bullets will not be a problem , If it was 22-250 were velocites are alot higher and you were handloading you might be able to get them spinning so fast they come apart . i have seen it by a freind who set out to do it . the twist problem is actually a result of bullet length and not weight , its just easier for the average shooter to see it defined in bullet weight since all bullets are sold by weight and bullets of the same weight are close in length . the longer the bullet the faster the twist needs to be.

[Beelzy]

Booboo post! LOL!

[Waldog]

You got that backwards! 1/7 stabilizes HEAVY bullets up to 90gr VLD in the 223. 1/9 will work perfectly for 55.gr

[freonr22]

how about 1/9 for the 45grns?

[5150Marcelo]

1:9 perfect for 55 grainers.

[foxtrotuniformlima]

I saw this somewhere else and kept it for reference:

Twist rate is based on what length of bullet you are going to use, not the weight.

Twist = 15 X D2/L

Where:
D = bullet diameter in inches
L= bullet length in inches
15 = a constant

Now, why the bearing surface length is not considered I do not know but for 69gr SMKs, this formula gives you a 7.479 and for 55gr FMJBT's I get a 9.155. Both #'s are consistent with what is known to work well so I figure it works,

[johnrunner89]

My 1/9 twist loves 55grain and I am pretty sure yours will too.

[rtlltj]

I shoot 55gr all the time but for varmint hunting I have only found non lead ammo in lightweight grains like 36 or 43gr. Before I go and buy some 36 or 43 gr ammo I'd like to hear from someone who has used it.

[johnrunner89]

Lowest I shoot is that 45grain Winchester white box hollow point varmint loads. my Stag seems to eat it up no problem and it shoots great.

[diginit]

1:9 twist is designed for a 45 to 69 g. bullet. 36g. is too light and will spin the jackets off. Which is fine if you like a .223 shotgun. I've heard of some 1:9 rifles shooting the 75 gr. But I think they would keyhole in a 16" barrel.
Go to http://www.ar15.com/ and check out their explainations.
Sorry CG. But we both love the same thing, Right?

[bridgeport]

Barnes makes a 50 grain varmint grenade, and Hornady makes a 50 polymer tip bullet. I have a few boxes and some handloads with these bullets I am not going to use. PM me.... I will send you the handloads to try and you can see if that weight bullet works for you.

[rksimple]

I ran some Hornady 50gr SX bullets through my 1 in 9 savage 12fv. About 1 in 5 never made it to the target. The lighter, more "explosive" varmint bullets can get ripped apart by high velocity and tight twists. I wouldn't go under 55gr or if you do, keep the velocity down.

[Fjold]

Barnes makes a 50 grain varmint grenade, and Hornady makes a 50 polymer tip bullet. I have a few boxes and some handloads with these bullets I am not going to use. PM me.... I will send you the handloads to try and you can see if that weight bullet works for you.

The 50 grain Barnes (because it has no lead) is as long as the 68-70 grain bullets and should be shot in 1:9" twist or faster barrels.

The Barnes 36 grain bullets are about the same length as a 50 grain cup and core bullets and will stabilize in slower twist barrels.

It's not a problem stabilizing bullets with too fast of a twist, the problem comes from the jackets of the bullets being over stressed as that they are forced down the fast twist barrel and weakening them to the point that they fail before they hit the target.

[sargenv]

If they are made by Barnes.. they might be all copper so the idea of spinning the jacket off.. might not apply, especially if these are the bullets made for shooting in the areas where non lead bullets are the rule. Someone else stated above, it's the length of the bullet that needs the faster twist rates, not the heavier weight. Just with conventional copper jacketed bullets the longer bullets tend to be heavier. A whole nuther ball of wax if these are all copper bullets.