A three gun match, 2,700 points, is shot with three guns. The .22 match and the .45 match require their named calibers. The center fire match allows you some latitude. Usually any center fire pistol caliber is permitted. When I shot for several Marine Corps pistol teams I used two center fire pistols. I had one of my 1911's converted to 38 Special that proved super accurate. I also had a second 1911 set up for soft ball: I shot Remington match .45 acp. I believe that it was 185 gr jacked bullets.
One of my .22's was a High Standard Supermatic trophy with a grip angle of a 1911.
I would suggest that for center fire that you use your 1911 with amminition in the same class as Remington match ammo.
Clifford L. Hughes