I am trying to develop a full power load for my ruger sp-101 (2.25" barrel). The bullet that I would like to use is the Lee 356-125-2R. The alloy is pretty much straight wheel weights. I powder coat the bullets after casting which gives me a final weight around 132 grains. I tried to interpolate some data from a Lyman reloading handbook to determine a good starting point. I settled on 17.5 grains of H-110. The powder is extremely dirty. Black residue coated the cylinders and residue was even on the outside of the spent brass. Is this a sign of under loaded cartridges? The accuracy was good as I was able to consistently hit a 6" round target at 50 yards. I just don't like how much cleaning I had to do with this combination. Anybody have any experience with this bullet/powder? What are the signs of under load?