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There are a few critical differences between 1/7 twist and 1/8 twist barrels. The most obvious difference is the Twist rate, or how quickly the rifling spins the bullet. A 1/7 twist barrel will spin the shell faster than a 1/8 twist barrel.
16 Μαΐ 2023 · The twist rate, typically represented as 1:7, 1:8, or 1:9, refers to the distance in inches required for a bullet to complete one full rotation in the barrel. Many gun owners believe that heavy bullets require a faster twist rate to maintain stability in flight.
18 Ιαν 2010 · Competition shooters often select 1:8,1:7 twist barrels to stabilize the long 77, 80 and even 90 grain bullets. 1:8 is found on most match grade stainless steel barrels. If you plan on engaging targets beyond 200 yards go for one of these choices.
19 Σεπ 2019 · Most modern, short-barreled AR-15s come in three basic twist rates: 1:7, 1:8, and 1:9. If you want a mil-spec rifle, the 1:7 barrel runs 223 ammo loaded with a 62 grain projectile like a dream. This rate of twist can also handle even heavier bullets (up to a hefty 90 grains).
I have numerous quality AR-15 barrels in varying lengths from 16" to 24" with 1:7 and 1:7.7 twists and while they do love the 77gr and 80gr pills a WHOLE LOT...they will each shoot 55gr ammo perfectly well.
11 Μαρ 2022 · For example, 55gr bullets fired from a 223 Remington work well in 1:9 twist barrels but in order to accurately fire a 75gr bullet from a 223 Remington however, a faster 1:8 or 1:7 twist barrel is needed. Opposed to what you may hear, the twist rate and barrel length have no direct relationship.
23 Φεβ 2024 · It’s important to know how barrels work in order to better understand how a bullet will perform within its confines. This article is an excerpt from The Ballistics Handbook, an invaluable guide to understanding the various factors that affect bullet flight, from the muzzle to the target.
