By gum! You sure-nuff started out real conservative with your loading! If I recall correctly, my first real conservative load bounced off the stump I was shooting at. I think I started off with IMR 3031 but realized after jacking up the powder levels that I would never get enough 3031 into the case to get anywhere near original velocities, so I went with a slightly faster powder, IMR 4198. Since then, I've developed a few other loads ....
15.5 grains of 5744 for 800 fps
17.2 grains of IMR 4227 for 833 fps
Both of these loads use a 250 grain soft cast (pure wheelweights) bullets.