The faster you push the 6mm bullets the slower the twist you can get by with . I would try the 85 gr Partitions in your 223 WSSM before i sold the rifle if i was you . 1&12 is my favorite twist in the 6mm's
Not a bad idea to try the 85 NPT and see what it does.
In my experience, speed helps but is a poor substitute for twist.
DF
