Here is something very interesting I saw on accurate reloading.
Accuracy with 240gr SMK from a 7.62x39mm 1-10" twist. Muzzle velocity between 1790-1900 fps and accuracy from .245" - .872" at 100 yds with 5-shot groups.
These results kind of lead me to believe just about any .308 bore cartridge with a 1-10 twist will work with the 240gr SMK.
Maybe the real issue is: at what velocity will a 240gr SMK become unstable if spun at 1-10. Maybe before going subsonic?? I don't know.
I believe the 300 Whisper uses a 1-8 twist to shoot the 240gr SMK accurately at subsonic velocities.
[ 06-08-2002: Message edited by: MontanaMarine ]