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Discussion Starter #1
want to buy a threaded barrel for my new 10/22 but don't understand the"twist" difference? which is better ? I've been told the 1:9 is better for heavier bullets and longer shots?
 

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The Shooterologist
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1:9 is typically used for heavier bullets and 1:16 for the 36-40gr.
I believe some of the older rifles (I've been told) had a 1:18 twist.
I am tempted to try a 1:9 twist on a 16 inch barrel, as I shoot 40 gr. subsonics mostly.
 

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A 1:16 will stabilze 40 gr subsonics.
The most accurate ammo for my std carbine barrel is CCI subsonics.
Aguila 60 grain bullets keyholed out of my 1:16.
60's wouldn't do that out of a 1:9.

In a centerfire, too much twist on a light bullet with a thin copper jacket at a high velocity can cause such a high rotational velocity (~250,000-300,000 rpm) that causes the bullet to disintegrate as it leaves the barrel (sling apart). Can't imagine that happening in the low velocity of a 22 LR (~54,000 rpm for 1:16 vs. ~96,000 rpm for 1:9)

Hopefully a 1:9 barrel owner will chime in with why they have one, other than novelty.

Google "greenhill formula" for for info that you probably want on barrel twist.
 

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I know you want a threaded barrel but i was going to but didnt because i dont want a supresser if u do go for it but if its for a muzzlebreak i wouldnt it makes the gun 5 to 10 DB LOUDER and the gas and lead shoots out the side or back depending on muzzlebreak so for a 22 the advantiges arent worth it other calibers sure. And about the twist ide say if your shooting 45 grain or less stick with 1:16 its overall better for reasons above the 1:9 for anything heavier for reasons above i shoot 32 grain varmit cci so a 1:16 twist is best
 

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Most of your 22WMR's are 1:9 due to the velocity of the round. As stated above, it is also used for 60 gr match ammo. Check this link about barrel twist rates out. Good info.
 
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