135
Great with 66-69 grn match bullets in the 6BR.
I did some accuracy testing a number of years ago with a 1-14 twist Keieger and N135. I treated it just like I would 133 and a 6PPC, arriving at a upper end load at 3500+ fps.
Accuracy was darned near what I could get with my 6PPC.
One thing of interest I did discover was N135 shares the same quirk as does N133, that being, when the humidity got really low, it wanted to go crazy, as in not wanting to agg. The cure was the same as we use with N133. Increase the load. A lot.
This is one thing that has lead me to believe that the cuprit that causes these powders to act this way is the coating, (retardents), that VV uses.
I have not done enoughbtesting with N120 that I sometimesuse in my 30PPC to seeif it shares this trait. It might not, as, while N135 and N133 have a similiar appearance, and are about the same grain cut, N120 is quite a bit finer cut, and darned near black in color........jackie