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Old July 7, 2008, 05:33 AM   #1
vincentvangerven
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Join Date: July 7, 2008
Posts: 2
which barrel to keep

First; A friendly hello to all from Europe

Guys, i got a question here, you might be able to give some advice about the following: i bought 2 green mountain 25 inch barrel blanks in .22 caliber.

One is a 1:14 twist wmr barrel, this one;
http://www.gmriflebarrel.com/product...aspx?id=324059

the other one a 1:9 5.56 ar15 type barrel, this one;
http://www.gmriflebarrel.com/product...aspx?id=324057

I'm planning to only shoot SUBSONIC .22lr rounds, with bullets in the 40/50 grain range at 100 yards.

So here comes my question:

Which barrel to would probably perform best at long range. Did a little bit of testing and at 40 yards & they both group well with 42 grain roundnose bullets, but didn't have the time nor space to take a few long range shots.

I'm trying to predict which barrel has the best chance of performing well with subsonic rounds at distances up to about 100 yards.

Will the 1:9 twist spin the bullet to fast at longer ranges, loosing accuracy, or will the 1:14 be too slow to stabilize the bullet at longer ranges?

Looking forward to your input, with kind regards, Vincent
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Old July 7, 2008, 02:15 PM   #2
Scorch
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Well, truly and honestly, neither of those barrels are intended for 22LR, and neither will shoot to their full potential with 22LR ammo. 22WMR uses a .224" diameter bullet, 5.56X45 uses a .224" bullet, but 22LR uses a .222"-.223" bullet, so the bullet will not fit the bore properly and could cause some shot dispersion. In addition, the 1:14" twist is a little fast, and the 1:9" twist is way too fast for a 40 gr 22 LR bullet. My recommendation would be to get a barrel actually intended for 22LR and use that. Since you are looking at Green Mountain Barrels, get one of their barrels made specifically for 22LR.
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Old July 7, 2008, 05:56 PM   #3
vincentvangerven
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Join Date: July 7, 2008
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ok, thank you for your reply. Kinda got confused on the bullet diameter , on this page it says .22 lr bullets are .223 above, but then lower it says .224 diameter....

http://en.wikipedia.org/wiki/.22_Long_Rifle

scroll down for a tech drawing wghere they quote .224

That's why i thought a .224 groove barrel should work. (and at least out to 35yards it does, one ragged hole)

Ah well, just gotta shoot some more at longer distances, then we'll find out.
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Old July 9, 2008, 03:42 PM   #4
Cowart
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FWIW, normal twist for a 22lr is 1:16
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