W231 and Unique are excellent powders. I have been using Bullseye in the 9mm, 38 Spl, and 45 ACP with outstanding success. I load on a progressive press so the chances of double charging with Bullseye (or W231) is low. There is always a risk of double charging when using a single stage, because charging is conducted off press, and you can get distracted. With a progressive you will find that you can load a lot of ammunition with Bullseye because the Charge weights are low. I use 4.0 grs with a 125 LRN in 9mm, 3.5 grs with a 158 L in 38 Spl, and 4.5 grains with a 230 LRN in the 45 ACP.
Bullseye is an outstandingly accurate powder and will provide consistant accurate ammunition up to standard velocities. It is the oldest powder on the market, over 100 years, and there is lots of loading data for it. It is not a magnum velocity powder. What I like is the excellent accuracy and the low extreme spreads I get. The lowest ES and SD's of any powder I have used. This is important for semi automatics as they work best with a consistant kick in the chamber.
I think all of my handgun reloading is more than adequately covered with Bullseye, Unique and 2400.
The only other powder I could recommend trying, in your calibers, is Unique. That powder is one of the most flexible I have used, but I think for your applications, Bullseye is the best.