1:12 twist to 1:7 twist.

[Dig138]

I was just given some 80gr bullets that say they're good for 1:12 twist. Well my gun is 1:7 twist. What would happen if I shot those bullets out of my gun? Would they be less accurate?

 

[Dale Alan]

Are you asking about .243/6mm ?

 

[Archie]

No real way but to try it and see.

I expect no discernible problem with accuracy. Normally a longer (therefore heavier unless using a different composition) bullet requires a faster twist. However, correct twist is more of a 'range' (no less than X, no greater than Y) than an exact, specific figure. I have noted over time that a lot of overspin is better than just a bit of underspin.

 

[FROGO207]

Yeah what caliber are you talking about. It makes a difference.

 

[Kp321]

The problem with going to a fast twist is the possibility of centrifugal force damaging the bullet at higher velocities. Whereas the stabilizing twist can be calculated, each bullet type has unique construction that will effect its ability to resist centrifugal force damage.

 

[Dig138]

Yeah what caliber are you talking about. It makes a difference.

.22 cal

 

[Dig138]

Are you asking about .243/6mm ?

no it's. 22 cal

 

[Dig138]

The problem with going to a fast twist is the possibility of centrifugal force damaging the bullet at higher velocities. Whereas the stabilizing twist can be calculated, each bullet type has unique construction that will effect its ability to resist centrifugal force damage.

Ok. So what do you think? Can I shoot a 80gr bullet that says its for 1:12 twist out of my AR that's 1:7 twist

 

[Dale Alan]

Your bullet weight and twist will work fine together .

 

[Jim Watson]

It will do ok.

What 80 gr .224 claims to be stabilized in 12 twist?

 

[jmr40]

Generally speaking a 12 twist doesn't shoot anything heavier than about 55 gr well. The 80 gr bullets generally are for 7 twist. You should be fine.

 

[Walkalong]

It will do ok.

What 80 gr .224 claims to be stabilized in 12 twist?

Yep, where did you see that? No way 1 in 12 stabilizes an 80 Gr bullet in .22 caliber.

But, as posted, your 1 in 7 will work just fine with it.

 

[Jim Watson]

Speer makes a blunt 70 gr and Sierra a semipointed 63 gr for use in 14 twist. Bullet length is what governs stability.

But 80? Maybe a wadcutter.

 

[FROGO207]

Yeah when you said 80 grains I thought you were talking about a 6MM/243 bullet with that twist. Length of bullet contact and bore diameter are variable when talking twist rate and bullet diameter.

 

[Bcwitt]

Weight isnt really the stability limit. It is actually length. Assuming similar construction, heavier is longer. If it was a zink bullet (lighter then lead) it would be quite a bit longer per weight, requiring more twist. If it was a tungsten or DU cored projo (denser then lead) you could expect stability in a shorter twist per given mass. Is better to use a caliper then a scale to determine twist requirements.

 

[Dig138]

It will do ok.

What 80 gr .224 claims to be stabilized in 12 twist?

Nosler 80gr competition

 

[Dig138]

Nosler 80 gr bullets a box of 250 count competition says this bullet is rated for a 1:12 twist. Well I wanna shoot it out of my AR which is a 1:7 twist.

 

[Dig138]

Nosler 80gr competition

 

[kcofohio]

Nosler's site shows a minimal twist of 1:8 for your bullets.


Which you'll be fine with 1:7. Just not sure where you may have seen 1:12 twist.

 

[herrwalther]

According to numerous charts online, 80gr .224 bullets work better/more accurate in 1:7 than they do in 1:12

 

[Jim Watson]

Well, I have some leftover ammo loaded with 80 gr Noslers.
But I'll be shooting them in a 6.5 twist originally bought for 90 gr.

 

[milboltnut]

Nosler 80 gr bullets a box of 250 count competition says this bullet is rated for a 1:12 twist. Well I wanna shoot it out of my AR which is a 1:7 twist.

They will not stabilize in 1:7 twist. faster twists are for long bullets with more bearing surface.

 

[horsey300]

They will not stabilize in 1:7 twist. 1:7 is designed for long bullets with more bearing surface.

Ummmmmmmmmmmmmmmmmmmmmmmmmmmmm not sure if this is a wink wink situation.....

 

[Jim Watson]

It isn't the bearing surface it is the total length, boattails and spitzer points count too. I see there is some ballistic calculation accommodation for plastic points, though.

 

[milboltnut]

It isn't the bearing surface it is the total length, boattails and spitzer points count too. I see there is some ballistic calculation accommodation for plastic points, though.

true... longer bullets in general