Butlerford:
I shoot target loads in bullseye guns (which are built with lighter recoil springs than typical 1911s). The load I'm using in one particular gun is 3.6 grains of bullseye with winchester WLP primers and 185 grain cast bullets. This will probably be too light to cycle most 1911s. 3.9 grains probably will cycle the action of most 1911s and will give a velocity of about 800fps. Taper crimp is to .469". Load also works with 200 grain lead SWCs. 3.9 grains of bullseye is the standard for bullseye competition shooters. 3.6 grains is considered a mild load for indoor shooting.
It doesn't have to be a three powder affair. I see no difference in accuracy between 231, Clays, and Bullseye (and I'm hooked on precision shooting.) 231 meters the best, but charge weight is significantly greater so you get fewer rounds per pound of powder.
I do recommend the winchester primers, though. They really make a difference for clean burning. They tend to be cheaper too.
Very interesting to note is that when I first started loading 45ACP I used my RCBS powder measure to meter Bullseye powder. This drove me crazy because the powder seemed to be magnetically attracted to the measure and I could not get consistent charge weight. That's why I switched to 231. With the Dillon press, Bullseye meters very uniformly.
Clays does seem to be cleaner burning than Bullseye. Bullseye burns sootier.
What will I use in the future? Probably Clays. It seems to have the best combination of light charge weight, clean burning, and accuracy.
I don't have my charges for 231 and Clays handy, so I can't tell you now what they are.
Some other 45ACP loading tips:
1) Do not use Amerc brass. Trust me.
2) S&B brass often has tight primer pockets, so I don't value it highly
3) Ed Masaki, the famous 1911 gunsmith, did accuracy tests that prove mixed brass to yield loads just as accurate as single-manufacturer/single-lot brass.
4) Getting the taper crimp right is critical to getting good functioning.
5) The 45ACP is very forgiving to load.
6) Case capacity is such that you need to be careful not to do double charges.
7) Most competition shooters who shoot for accuracy use Bullseye or the fast Vihta Vuori powder (310 or 320, I can't remember which.)