My first problem with this is the twist rate, really 1-7! A 1-7 will not stabilize 55 grain rounds worth a chit, that twist is for 60+ grain rounds. I can run 62 grain rounds through my 1-9 with no problem or loss in accuracy. This move towards slow heavy rounds defeats the purpose of what is considered hi velocity rounds. I’m on a ranch every day and carry several rifles, none of my rifle ammo combinations shoot less than 3500 fps. On one rifle I run a 1-12, it’s STEYR pro hunter 243 running around 3950 with a 58 grain pill.
“On one rifle I run a 1-12, it’s STEYR pro hunter 243 running around 3950 with a 58 grain pill.”
Dude! Instant mail.
Nonsense. Try this this link for advice from a ballistician:
Understanding Twist: Bullet Stabilization
The reason the military settled on a 1:7 twist is to stabilize the M856 tracer. It's about the same length as a 80 grain BTHP.