When i got the Lyman mold for their 200 gr lswc bb bullet years ago, i worked up a loading using Bullseye powder.
As cast bullets were sorted by weight and visible flaws. Sized and lubed. Loaded. Fired from sand bags @ 50 yards, 3.8 grs Bullseye produced the best accuracy. Loaded in Starline standard brass with a WLP , using RCBS dies.
The .452" bullet diameter required opening the ID of the seating die. The case bell/flare was being removed to early on seating. This shaved lead & left a ring of lead to build up in the chamber.
The 3.5 gr is ok at 25 yards, not great at 50. What works for my Gold Cup may not work for all 1911s.
Testing is the only way to know if a firearm will benefit from match grade ammo.