My 6.5-'06 has a 9" twist Shilen barrel cut to 23.6" (or 600 mm). I have used bullets ranging from 120 gr to 165 gr in weight (or course it is bullet length that matters most in stability). I ran into the limit for this rifle between 160 gr round nose (Hornady worked very well for accuracy) and the 165 gr semi-spitzer (Original Barnes produced 4" groups at 100 yards).

jim


LCDR Jim Dodd, USN (Ret.)
"If you're too busy to hunt, you're too busy."