After thirty years of using Unique, I branched out and tried several others. In the end, Winchester Super Target (WST) wins out. Inexpensive, fairly clean, nice, snappy, reliable action in 1911s, and the big bonus- it's quiet. I actually had a match director question my power factor because my loads seemed too quiet. (I chronoed fine.)
I also went away from lead after even more than 30 years of it. Rainier TMJs make cleanup time easy, and if you buy right (Cabelas works for me), they're only slightly more expensive than lead. Last I looked, they could be had for 7 1/2 cents.
4.5grs of WST with the 230gr round nose Rainier makes a little more than 700fps in warm weather. I just plain settled on 5.0 (according to my ancient scale) to get 810fps from a 5" gun on a warm day and know that my 4 1/4" Commanders will make major even in winter. I can't find actual official data for this exact Rainier/WST combination, and it does seem to exceed some 230gr published lead load limits, but I get no overpressure signs in my guns. If you're using a different bullet, you may be over the line with 5.0gr, and of course, starting lower is always necessary.
I also put up a puffball load with the same 230gr bullets and 3.5gr of WST to get barely 600fps in a 5" gun, and about 550fps in a 3 1/2". This runs well in most guns, even my Para Companion, with the nice quick burn to get the slide going, and recoils like a .22 in a GM. With a 10-pound spring, this is super-quick for steel plate competition, and may bring cheating complaints from the peanut gallery. Heh.
My wife thinks it's just the thing for "doing the dishes"- plate rack cleaning.
Bullseye was indeed the original .45ACP powder and can't be beat for reliable function, if not cleanliness.
1911s, it seems to me, prefer a quick start to the burn cycle and WST and Bullseye (and their ilk) are the best in this regard.
Bill