It's hard for anyone to say what powder will work best in your rifle. If I HAD A PRO HUNTER... I would start my loads with 100 grains of Triple Se7en 2f, shoot a group, swab between shots, and then kick it up to 110 grains of the same powder loose. Again, swab between shots. If you still have good accuracy, kick it to 120 grains and do the same again. if you feel the need for speed.

Don't get too wrapped up in the 150 grain story. Unless you're shooting pellets and your rifle likes those strong loads. If all you're hunting is whitetail or mule deer, even 100 grains of powder is a great plenty in most circumstances.