SU35,

The long-time standard 1-14 twist in the 9.3x62 will easily stabilize even the Woodlight 320 spitzer. I know this not because of using rifling-twist formulaes, both old and new, but because my 1-14 twist CZ 550 shoots it under an inch, just like it does about any 9..3mm bullet--including the very long 286-grain Barnes TSX.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck