Does barrel twist rate matter for 6.5x55 Swedish rifles?

The Importance of Stability

The 6.5x55 Swedish cartridge is known for its flat trajectory and high accuracy potential, but it requires a suitable barrel twist rate to stabilize the bullet effectively. The optimal twist rate for this cartridge depends on the type of bullet used. For hunting large game like moose, a heavier bullet with a longer ogive is required, and a slower barrel twist rate is often necessary to prevent excessive bullet wobble. A twist rate of 1:7.7 to 1:8.3 inches is commonly used for 6.5x55 Swedish rifles chambered for moose hunting, as it provides sufficient stability for bullets weighing up to 140 grains.

Choosing the Right Twist Rate

When selecting a barrel twist rate for your 6.5x55 Swedish rifle, consider the weight and type of bullets you will be using. Heavier bullets require a slower twist rate to prevent instability, while lighter bullets can handle a faster twist rate. For moose hunting, a slower twist rate is generally preferred to ensure the bullet remains stable and on target. A good rule of thumb is to choose a twist rate that is 1.5 to 2 times the bullet’s diameter. For example, a 140-grain 6.5mm bullet would require a twist rate of at least 1:8.3 inches to remain stable.