Your rifles twist rate is one turn in 9inches/1 in 9.this is for a 223 cal
http://www.winchesterguns.com/prodinfo/catalog/itemdetails.asp?cat_id=535&type_id=943&cat=001C&item=535943268
Them twist rate of a Winchester model 70 rifle in .223 Rem.is 1"in 9".
The twist rate in a Winchester 670, 243 caliber is 1:10.
twist is 1:9
9.5
1 in 9"
1-12"
The answer to this q? is 1-9"
1/10
The answer is 1:10
1 in 10
1-10