First - there is NO guarantee that any one .452 diameter bullet will work well in both your 1911 and your rifle. NO guarantee. NONE. But, good news abounds - it's cheaper to buy different bullets than it is to modify guns to shoot a particular bullet real well. 
Second - if you want simple, put the 1911 away. It's not tough, but it's not simple. It's very fun, but it's not simple like a SAA revolver is simple.Here's Alliant's published max load for that bullet weight:
45 Auto 200 gr Lead bullet 1.19 OAL Red Dot 4.5grains 831 FPS
That is the velocity (or very slightly slower) you want for Wild Bunch, as it translates to 166 Power Factor.
Your cartridge OAL will depend upon what feeds and chambers well in your 1911. Be aware, there may be problems with the front driving band and first section of the rounded nose jamming tight into the rifling, as the 45 auto barrel is cut with NO throat at all before the rifling starts. You don't EVER want that jamming into the rifling to occur. A tight slug raises pressure, and a tight slug can be pulled out of the case when you clear the pistol with a live round in the chamber! And a slug touching the rifling lands is just a smidgen away from not chambering all the way, leading to a round that will not fire, and has to be ejected, and probably made up at some time.
Seat your first loads at an OverAll Length (OAL) to put the mouth of the case right where the front driving band starts to turn into the round nose. Ignore any crimp groove that may be on the slug, crimp into the top edge of the driving band. Taper crimp, which is what a good 45 auto crimp die produces, so that the mouth is taken down from the slight expander belling down to about 0.471" (no tighter than 0.470") diameter right at the mouth.
Load only five or ten, then go shoot. If the bullet won't chamber the last 1/16", but will seat with a firm slap on the rear of the slide, seat slightly deeper. If bullet sticks with the nose on the feed ramp, you may need to shape and polish the ramp (a job better left to gunsmith until you gain experience with it).
If bullet jams with a 3-point jam, you may have a poor quality magazine. Colt, Tripp or McCormick mags remove the doubt about that.
If you still have a problem feeding, and the bullet's flat point is very broad, you probably have a feed-ramp/barrel throating problem.
Starting 10% under Alliant's max load, you might start at 4.1 grains of RD. Work your way up.
You WILL need to shoot your load over a chronograph, as velocity/power factor is watched closely at major Wild Bunch matches. And each 1911 shoots the same load to different velocities. When you get a good PF, good extraction, good feeding, good accuracy, and a good feeling - stop, you are probably done!
Good luck, GJ
