G'day John. The 1911 should handle Field Pistol (Metallic Silhuoette 25, 50 75 & 100M) ok with a bit of elevation guestimation. The Big Bore version (out to 200M) would be a bit more challenging.

Depending on your State there are a number of other matches approved for greater than 38 cal: Classic, Wild Bunch, Service Match, etc.) Unfortunately it all depends on what your State authorities deem "approved". Good luck