Posted: 12/9/2008 4:47:08 PM EDT
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Ok, i know that the higher the twist rate, the lighter the bullet needs to be. But, what is the major differance between 1X7 and 1X9 twist rates. Are both good to go for a standard carbine?
P.S. does it affect the use of a suppressor? |
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1X9 can shoot up to 69 grain bullets with no issues. Some 1X9s even stabilize 75 grain from time to time depending on the manufacturer and barrel lot. 1X7 will shoot heavier bullets better (77gr), and can also stabilize the 55 grains as well.
Both work with suppressors just fine. If you have a choice, I would get the 1X7. But most of my ARs are 1X9 and shoot great with up to 75 grain bullets. |
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Quoted:
Ok, i know that the higher the twist rate, the lighter the bullet needs to be. But, what is the major differance between 1X7 and 1X9 twist rates. Are both good to go for a standard carbine? P.S. does it affect the use of a suppressor? It's the opposite. The higher (faster) the twist, the heavier (and longer) a projectile the twist will support. The a 1/7 twist rate means that the rifling makes one complete twist every 7 inches of length. 1/9 is one twist in 9 inches, so it is slower. You can shoot lighter projectiles in faster twists, but there is the possibility that super-light projectiles in a faster twist will spin fast enough to destroy themselves mid-flight. That's the theory anyways. Both 1/7 and 1/9 are fine, but if you're shooting anything above 68gr. ammo, you'll want 1/8 or 1/7. 1/7 is becoming a more common twist, but there's still a MUCH smaller selection. The cheapest and most common ammunition is going to be 55 gr. ammo, which functions absolutely fine in 1/9 barrels. I like 1/7 barrels, but I also have 75 gr. OTM as my home-defense rounds. |
