[Unclenick]

If you're going to run the bullets that slowly, you can get more mileage from a faster powder. You'll be tossing a lot of unused 4198 out of the barrel at those low pressures, and having to use more grains of it to get there. I would suggest about 21 to 25 grains of IMR 4759, the traditional rifle light load powder, would be a good place to start for accuracy because it fills the case better than similar charge weights of other powders.

If peak accuracy is not your main concern, you will find a slow shotgun powder like Longshot or Blue Dot has better economy and will get the same velocities with just 16 to 20 grains, give or take a grain. The peak pressures will be higher with the faster powders, but still nowhere near what the rifle will tolerate.

All the above assumes the 165 gr. gas checked cast bullet.