My experience with RL 19/165's in the 30-06 leads me to believe it acts slower than the various 4350's. For example, I was at the point of marking case heads (one lot of ww cases) with 60 gr of IMR 4350 and 61 gr of H4350, but it took 63 grains of Reloder 19 to do the same. Velocities were a bit faster on this test with RL19, but not enough to make a significant difference. If you can get your hands on some, Tod, you should try Vihtavuori N160. It really shines in my 06's with the 165. I am at around 61 grains. As usual don't use any of these loads without working up from below. Regards, Eagleye