.223 1 in 7 twist ammo suggestions?
 

I was told that with a 1 in 7 barrel I should not shoot 55 grain bullets and that i should use something more like a 60 or like the 62 grain bullets i am currently sighted in for.

I dont know much about the whole ballistic things but should I be shooting a heavier or lighter bullet?

THANKS!

RE: .223 1 in 7 twist ammo suggestions?
 

1 in 7 , I would be shooting >62gr, maybe try 75gr.

RE: .223 1 in 7 twist ammo suggestions?
 

what exactly does 1 in 7 mean?

and what would happen if i was to use a 55 grain?

RE: .223 1 in 7 twist ammo suggestions?
 

Krieger barrels recommends a 1in8 twist for the 75 grain bullet. The 1in7 is for bullets that are 75 grain and higher. 1in9 or slower is good for 55's. Tom.

RE: .223 1 in 7 twist ammo suggestions?
 

bummer....so what will happen if i use a 55 grain nosler BT......just bad accuracy?....or worse?

RE: .223 1 in 7 twist ammo suggestions?
 

Ain't gonna hurt! I shoot 55's in my 1/7 barrel,just the 1/7 handles heavy bullets better than 1/9 to keep them from keyholing.Just don't try to push them too hard o the lite slugs.

RE: .223 1 in 7 twist ammo suggestions?
 

just not ideal spin for the bullet length. 1 in 7 is fast. I myself would pick 1 in 9 or so. You can get great stabilization for 52gr, 55gr, or 62gr. 75gr may be pushing it.

RE: .223 1 in 7 twist ammo suggestions?
 

ok....because i guess the "nato" rouns i have are 62 grains and they were grouping fine but all the bullets i want are 55 grain.

Will it hurt the gun to shoot a 55 grain bullet? Will it affect my accuracy and by how much?

Thanks guys....i knows i always have a lot of questions!

RE: .223 1 in 7 twist ammo suggestions?
 

As with any Firearm , trying different ammo manufacturer's and bullet weights is a fine way of seeing what the Firearm/shooter likes ordislikes. Try them, see ifyou like the waythey perform.Try diff.brands with the same that weight bullet to see how they do.

RE: .223 1 in 7 twist ammo suggestions?
 

Okidokie!

Now i just gotta find a bullet! lol

RE: .223 1 in 7 twist ammo suggestions?
 

I bet it will shoot the55's just fine.

RE: .223 1 in 7 twist ammo suggestions?
 

ok!

RE: .223 1 in 7 twist ammo suggestions?
 

The 1:7 twist is for longer heavier bullets ie; 69gr on up to the 80gr. The 55gr bullets will shoot from the 1:7 without doing any damage but your accuracy could suffer. I had a hard time with accuracy with the lighter bullets out past 200yds so I use the 69gr Sierra match king andthe problemwas solved. Thematch king bullets are a hollow point with a thin jacket andexplode when entering an animal. I thinkyou would like the results and the accuracy more than with the 55gr bullets.

RE: .223 1 in 7 twist ammo suggestions?
 

Well i just sighted in with the 55 grain noslers but if i have any trouble ill go to the sierra match kings....

RE: .223 1 in 7 twist ammo suggestions?
 

since no one answered your ? about what does 1 in 7 mean, it means that there is one twist of the rifeling every 7 inches. thats a fast twist. they can go as slow as 1 in 14, thats 1 twist every 14 inches. the faster the twist the heavier the bullet that you can shoot.

RE: .223 1 in 7 twist ammo suggestions?
 

cool....thanks

is the deal still on babe!
 

is the deal still on babe!

RE: is the deal still on babe!
 

BHB, what rifle are you shooting?

RE: is the deal still on babe!
 

i am shooting a Colt Sporter II Ar-15 in .223.

RE: is the deal still on babe!
 

Agree with Head, you need to consider a 75 grain bullet.Typical 223 is 1 in 12. I have a friend that just had a 22-243 built with a 1 in 8 twist. He was determined to try his 55 grains based off his 22-250 load before he had the gun rebuilt. Found out the gun make was right when he recommended the 90 grain bergers. He couldn't come close in his groupings with the lighter bullets to the accuracy he is getting out of the 90 bergers.

RE: is the deal still on babe!
 

ok....well im gonna have to test these out a bit more before i decide for sure.....

RE: is the deal still on babe!
 

well how about our date BHB :)

RE: .223 1 in 7 twist ammo suggestions?
 

1 in 7" means that the barrel's rifling will cause the bullet to rotate one time in every seven inches of forward travel. Required twist is determined by BULLET LENGTH instead of weight-supposedly, a heavier bullet is longer, but not always. A stubby round-nose or blunt bullet can be heavier than some lighter ones that are streamilned. Length of the bullet determines the twist rate required to keep them flying point-forward!

For example, a bullet with a boat-tail must spin faster than a flatbase one of otherwise identical shape & size-the boattail making the one longer than the other. I had a .222 Remington with a 1/14 twist that shot 55-grain flatbase bullets into 0.5 MOA, and 55-grain boatails into about 4"!

Use the Greenhill formula to calculate the needed twist:

150 divided by thebullet length IN CALIBERS equals the required twistrate IN CALIBERS.

Let's sayyou have a .224", 75-grain bullet 4.5 calibers long (1.008"). 150/4.5= 33.33 So, therate of twist needs to beone turn in 33.33 calibers. Your caliber is .224", so 33.33 X.224 = 1 turn in 7.46". In this example, the bullet MIGHT be stabilized by a 1/8" twist. but will definitely work OK in a 1/7" twist. It would be on the very ragged edge of instability in a 1/9" twist. MV does help somewhat in stabilizing bullets fired in too-slow a twist, but not very much! I'd rather have a bullet spinning too fast ("overstabilized") than too slow. Usually. a bullet that keyholes when it strikes the target is spinning too slowly.

RE: .223 1 in 7 twist ammo suggestions?
 

wow.....so could you do those calculations with a 55 grain?

Thanks!

RE: .223 1 in 7 twist ammo suggestions?
 

I can do it for ANY bullet that tickles you. Just tell me how LONG it is, and it's diameter. Weight, as I mentioned is not pertinent to determining the required twist. For example, a .30-caliber bullet, 1" long, needs a twist of1 turn in 14.22" to stabilize it,whether it is a lead bullet weighing 180 grains or a zinc bullet weighing25 grains..............

RE: .223 1 in 7 twist ammo suggestions?
 

ok THANKS!

ill have to measure one of them!

RE: .223 1 in 7 twist ammo suggestions?
 

ok....well i measured one and it was 11/16"

idk if you can do it with a fraction but i couldnt find my good set of calipers.......