I just started shooting the 45 phase of Bullseye (had been shooting centerfire with a 32). I am loading my own with 3.7 - 3.8 grains of Bullseye behind a 185 JHP. I am amazed how dirty the 45 is. Is there a cleaner propellant that can be recommended?
American Select is clean burning and reasonably priced. Around 4.0 grains works well in the .45 ACP with either a 200 gr. LSWC or 185 gr LSWCHP bullet.
I use 3.8 gr. VV N-310 behind the 185 gr. Star LSWCHP - about as clean burning a load as one can get with a lead bullet. WST and American Select also provide fairly clean loads with lead bullets at velocities of 725 to 800 fps.
Powders are dirty at light loads but I prefer to put up with as light a load as will not alibi and still be accurate at 25 yards. If you are shooting 50 foot indoors, accuracy is even less important. Just because a certain hotter load in a gun is more accurate it doesn't matter if you can't recover from the recoil well enough for the remaining shots. It isn't that hard to clean the gun and even with slow bullets and dirty burning it takes a long time to cause a problem. -- Bill --
I should mention that my favorite 50 ft and 25 yard buleeye pistol load is 3.8 gr. HS-700X, Rem 2.5 behing a 185 gr. LSWC at ca 720 fps. Very accurate and mild load which leaves you with some unbyrned powder flakes on your arm.