Actually with the extra velocity and depending on the ALTITUDE(s) you will be shooting at a 1-7 could work quite well with our 90gr VLD. Use the TWIST RATE CALCULATOR on our website: http://www.bergerbullets.com/twist-rate-calculator/ to confirm. If you have any questions please contact us at 714-441-7202 or email us at support@capstonepg.com7s do fine with the 90 SMK. It's the Berger and JLK 90s that need a faster twist.