Seems that 1 in 8 twist is pretty optimal for shooting 55 grain to 75 grain bullets. 1 in 7 tends to be overkill for 55 grains. I've seen good results with 1 in 9 inch twist too for a variety of projectile length.
Ugh! I'm still confused. I believed that 1/8" twist rate was the do all twist rate, so I bought a 14.5" barrel with that rate to be used with my defensive AR-15. I believed this twist rate would match well with the M193 bullets I've stockpiled. I hope I'm not wrong.
Your 1/8 twist should do just fine with those. 55 grains is on the small end of whats optimal for that twist, but the 1 in 8 is considered the best all around twist for ARs by many.
The point about SS109, even though it's 62 gr, being different than steel-free 62 gr seems to be something that is neglected in twist rate discussions in messageboards.
77 is the biggest that will fit into a magazine so this is still misleading information. The 1-9 is able to shoot the 77 grain. That is why we chose these years back because of it being accurate with all ammo grains. The AR twist chart isn’t needs adjustments in my opinion. . 1-12 twist is a rare twist rate in my opinion too. Maybe in the longer gas systems?
As far as I understand the twist rate does not affect barrel size. As bigger twist rate would have smaller groove twists, resulting in quicker bullet spin. Inner barrel should remain same size. Correct me if I am wrong.
Seems to me you just get a certain grain stick to it zero your rifle to it and everything will be fine I've never fired anything except for a 55 grain and it's always panned out excellent.
Very short barrels can have trouble fully stabilizing bullets unless you increase the twist rate. Maybe you remember the case when people built AKS-74u clones by cutting AK-74 barrels down from 16" to 8" (roughly), only to find the rifles were keyholing. Russians prevented this by increasing the 74u barrel twist rate by 20% as opposed to the full length 74, to compensate for the shorter length available to impart rotation on the projectile.
Absolutely the quickest and most thorough explanation. Not drawn out a boring.👍
Short and right to the point. Thank you I have learned a lot today.
Overwhelmingly, 5.56/.223 is sold in 55 & 62 grain, so why are most barrels sold in 1:7 twist rate?
Good question, i wonder the same
Seems that 1 in 8 twist is pretty optimal for shooting 55 grain to 75 grain bullets. 1 in 7 tends to be overkill for 55 grains. I've seen good results with 1 in 9 inch twist too for a variety of projectile length.
How are twist rate and barrel length related? Do you need a faster twist for a shorter barrel and slower twist for a longer one ?
Ugh! I'm still confused. I believed that 1/8" twist rate was the do all twist rate, so I bought a 14.5" barrel with that rate to be used with my defensive AR-15. I believed this twist rate would match well with the M193 bullets I've stockpiled. I hope I'm not wrong.
Your 1/8 twist should do just fine with those. 55 grains is on the small end of whats optimal for that twist, but the 1 in 8 is considered the best all around twist for ARs by many.
16” 1:7 twist is perfect
Can you guys do this video but for the AR-10??? I’d like to see the same chart for .308 and possibly 6.5 creedmoor
Great video. I love Brownells
The point about SS109, even though it's 62 gr, being different than steel-free 62 gr seems to be something that is neglected in twist rate discussions in messageboards.
Along with other bullets like lead free, people get stuck on the weight of the bullet when the main issue is actually the length.
Yup..all I want of to shoot. Is 55g 223 . so 1in8?
@@305dade8a 1 in 9
And yet 1:7 is the most popular even thought he most popular bullet I’m thinking is 55 grain.
does shooting boattail ammo change the optimum twist rate?
77 is the biggest that will fit into a magazine so this is still misleading information. The 1-9 is able to shoot the 77 grain. That is why we chose these years back because of it being accurate with all ammo grains. The AR twist chart isn’t needs adjustments in my opinion. . 1-12 twist is a rare twist rate in my opinion too. Maybe in the longer gas systems?
Can you please do this video but for AR 10s
Linus Tech Tips
Brownell Tech Tips
Both interesting, but very different
Alex Pierce SCUBA Tech Tips.
Brownells!
With the 3 different twist rates, 1:7-1:8-1:9 is there a chart to show the difference in the actual barrel hole size??
As far as I understand the twist rate does not affect barrel size. As bigger twist rate would have smaller groove twists, resulting in quicker bullet spin. Inner barrel should remain same size.
Correct me if I am wrong.
@@righteousone8454 sounds correct.
Thank you
Nice explanation
Does barrel lenght play any part?
Thanks
Seems to me you just get a certain grain stick to it zero your rifle to it and everything will be fine I've never fired anything except for a 55 grain and it's always panned out excellent.
So if I want to use a conversation kit for .22 lr higher twist rate barrels are better when hunting rabbits
Всё равно хлипчеватей Калашмата выглядит, хотя качество зайбатое.
Does barrel length make a difference when it comes to twist?
Very short barrels can have trouble fully stabilizing bullets unless you increase the twist rate. Maybe you remember the case when people built AKS-74u clones by cutting AK-74 barrels down from 16" to 8" (roughly), only to find the rifles were keyholing. Russians prevented this by increasing the 74u barrel twist rate by 20% as opposed to the full length 74, to compensate for the shorter length available to impart rotation on the projectile.
Yes
Brownells does not warranty their products sold thru Optics Planet
1/10 is also a common rate today
where can I get the hat that the guy on the range has?
Unfortunately we no longer have this hat available.
You really didnt discuss the downside of fast twist. Nobody does! Whats actually going on here?