I tried fooling with it briefly in a model 70 sporting rifle, someone gifted me a box of bullets. Using old data I had from 173 gr GI match, I found a node for my rifle at 42.3 gr of 4064 (no indications of pressure)...but I was concerned, the holes on target looked a little hinky...so I then fired a few into clean cardboard...sure enough, some of the entry holes in the cardboard at 100 yds looked a little bit oval. So I wondered if the 1 in 12 twist was adequate for the bullet. Anyhow, I soon lost interest in burning more components, back to the good old reliable 168 SMK.