Barrels Twist Rate Chart | Black Rifle Depot




Understanding AR-15 Barrel Twist Rates: Choosing the Right One for Your Ammo

When selecting an AR-15, one of the critical considerations is the AR barrel twist rate, which is crucial for ensuring bullet stability and accuracy. The twist rate refers to how quickly the rifling inside the barrel spins the bullet, and it's represented by ratios such as 1:7, 1:8, or 1:9. Our infographic below demystifies this concept, presenting a clear comparison of which twist rates are optimal for different bullet weights.

For the Heavy Hitters: 1:7 Twist Rate

If you're a shooter who prefers heavier bullets, typically in the 75 to 77-grain range, then the 1:7 twist rate is your match. It's the tightest twist, spinning the bullet the fastest, necessary for the heavier rounds. This rate stabilizes the bullet in flight, ensuring precision and reducing the margin of error, especially at longer distances.

The Middle Ground: 1:8 Twist Rate

Those looking for versatility will find a friend in the 1:8 twist rate. This rate strikes a balance, effectively stabilizing bullets from 55 to 80 grains. Whether hitting targets at the range or hunting in the field, this twist rate accommodates a broad spectrum of bullet weights, making it an excellent choice for general use.

Lightweight Specialists: 1:9 Twist Rate

For enthusiasts of lighter ammunition, such as 40 to 50-grain bullets, the 1:9 twist rate is the ideal selection. It's a looser twist, ensuring that these lighter bullets are not overstabilized, which could affect accuracy. This rate is perfect for those who engage in varmint hunting or enjoy plinking with standard-weight bullets.

Choosing Your Twist Rate

The diagram above simplifies the relationship between bullet weight and barrel twist rate. When choosing your AR-15, consider the shooting you'll do most often and the importance of the bullets you'll use. If long-range precision with heavier bullets is your goal, go with 1:7. For a good all-rounder who can handle most types of bullets efficiently, the 1:8 is your best bet. And if you prefer lighter bullets for quick, short-range shooting, the 1:9 will serve you well.

Remember, the correct twist rate can significantly enhance your shooting experience, so choose wisely!