Looking at improving accuracy on the gun I don't yet have in my hands! http://rugerforum.net/images/icons/icon7.gif
Looking into barrels and I notice most barrels are 1 in 16, but a few are 1 in 9. The faster twist is for 60-grain Aguila bullets, if I read right.
From my experience with my .223 and .22 Hornet, the faster twist is better at stabilizing any bullet, as long as it doesn't spin it so fast that the bullet flies apart. With the .22 lr, the fps are never up to 2000 fps, so would we expect the bullets to come apart? Or are these non-jacketed bullets likely to disintegrate at the low .22 lr speeds?
Or is there another reason why the 1 in 16 barrels are better for the lighter, faster bullets--like stingers?
Angky, Shooting lead bullets is a whole different thing than shooting jacketed bullets. To compound the issue, 22 LR bullets are very soft lead. The answer is yes, lead bullets may fly apart when fired in a fast twist rate barrel. There's a huge difference in bullet spin rates. Let's assume a 1250 fps 40 gr bullet, which is a standard high velocity load. The formula for bullet spin in RPM is: 12 divided by twist rate times velocity times 60. For a standard 1:16 twist rate 12/16=.75x1250=937.5x60=56,250 RPM. For a 1:9, 12/9=1.33x1250=1666.66x60=100,000 RPM If you shoot hollow points, the velocity and spin rate are much higher.
AR-15 owners with 22 LR conversion kit have learned this the hard way. Most 40 gr solid bullets will stay together but any bullet lighter or faster will fly apart. Additionally, hollow point bullet construction lends itself to weak tinsel strength.
Iowegan,
Very, very interesting, to say the least!!!!
Sure glad I asked the question.
And I'm sure glad for the answer, full of good info.
Sure gives a guy something to think about (as already stated), and also something to help make plans as to what kind of barrel to put on.
Thanks!
Angky.
Lowegan makes some very good points, ones that many often over look when choosing barrel twist rates. Just as bullet weight is important since a heavier bullet is generally a longer bullet, you need to consider bullet material design and velocity. They are major factors that need to be balanced too!
IFFV,
This might be better in another thread, but I don't know how to move stuff--or if I'm even supposed to--so I'll answer here with what little I know about the matter.
My .223 has a 1/9 barrel. 35-45grn totally disappears; most bullets never hit the target. 55grn hit all over the place. It shoots 75grn right down the line. 68grn does pretty good too. But that's shooting .223 Remington ammo. I don't know about anything else--except a .22 Hornet (CZ) with a 1/16 twist. Won't put anything in the middle of the target over 40grn. Does pretty good with weights under that.
Now I'm learning about the .22LR in a 10/22 with a 1/16 twist. Got it yesterday, but can't get out to shoot it yet.
Not sure if this means anything of value, but thought I'd throw my experiences with twist rates in as a response to your post.
The basic question restarted with dealt with .22 rimfire bullet weights and barrel twists. My question relates primarily to the 60-grain Aguila subsonic load. Will it stabilize OK in the 1:16 rate barrels?
Looking at improving accuracy on the gun I don't yet have in my hands! http://rugerforum.net/images/icons/icon7.gif
Looking into barrels and I notice most barrels are 1 in 16, but a few are 1 in 9. The faster twist is for 60-grain Aguila bullets, if I read right.
From my experience with my .223 and .22 Hornet, the faster twist is better at stabilizing any bullet, as long as it doesn't spin it so fast that the bullet flies apart. With the .22 lr, the fps are never up to 2000 fps, so would we expect the bullets to come apart? Or are these non-jacketed bullets likely to disintegrate at the low .22 lr speeds?
Or is there another reason why the 1 in 16 barrels are better for the lighter, faster bullets--like stingers?
agksimon, I don't know where you read that but it's not true. There's a lot of information in this forum about bullet spin rates. You can do an advanced search for "twist rate" using my screen name and you should get several threads that discuss the effects.
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