Buying soon, which twist atre 6mm BR 1000 Meters

[coehorn]

Which twist rate would be best for Savage 6mm BR? Shall I get 1:8 or 1:12? I will be shooting 600 M silhouette (105 grain) and 1000 M steel targets only. No hunting. Thanks.

 

[KRP]

12 is too slow for the 105s.