I have a savage 111 chambered in 270 win. Measuring 1-9 twist. Barrel is stamped A3,M and sa or 90 by the nut. I have been hunting with this rifle close to 15 years and want to start reloading for distance but all the the data I have found is based on 1-10 twist. Has anyone seen this before and where can I find reloading information for this twist rate?