11-02-2018, 11:40 PM
When in doubt about twist rates for a bullet check out the Twist rate calculator on Bergers site. My 2 Grendels have 1:8 for a 24 inch barrel AR and 8.4 for the Bolt action with an Obermeyer barrel. Both do well with up to 103gr Berger Hybrids and 129gr ABLR bullets.
For other bullets than Berger you can put in the length weight and velocity to use their calculator
http://www.bergerbullets.com/twist-rate-calculator/
For other bullets than Berger you can put in the length weight and velocity to use their calculator
http://www.bergerbullets.com/twist-rate-calculator/

